Maybe it was vs It might have been: Expressing Uncertainty About the Past
Core PathWay
1 🌐 Introduction
When we talk about past events we’re not sure about, English gives us two main ways to express our uncertainty. The simpler approach uses words like maybe or perhaps with regular past tense verbs: ‘Maybe it was John’ or ‘Perhaps she forgot’. The more sophisticated method uses modal perfect structures: ‘It might have been John’ or ‘She may have forgotten’. Both express speculation about the past, but the modal perfect sounds more formal and allows for more grammatical complexity. Understanding when and how to use each form helps you sound more natural and express different levels of certainty about what happened. This semantic field is essential for everyday conversations, investigations, and any situation where you’re piecing together past events.
💬 Dialogue 1: What Happened at the Office?
Two colleagues trying to figure out why their manager was upset yesterday
2 📋 Lexical Categories
Adverbs for Simple Speculation (with Past Simple)
Maybe – used to say something is possible but you’re not sure. ‘Maybe it was a mistake.’
Perhaps – similar to maybe but slightly more formal. ‘Perhaps she was tired.’
Possibly – suggests something could be true but you have doubts. ‘He was possibly at home yesterday.’
Probably – indicates something is likely true (higher certainty). ‘She probably forgot about the meeting.’
Definitely – expresses strong certainty that something is true. ‘He was definitely there – I saw him.’
Modal Perfect Structures (for Complex Speculation)
May have been – expresses possibility about a past state or identity. ‘It may have been the wrong address.’
Might have been – similar to may have been, often slightly less certain. ‘She might have been upset about something.’
Could have been – suggests a past possibility or alternative. ‘That could have been dangerous.’
Must have been – expresses a strong logical conclusion about the past. ‘He must have been surprised by the news.’
Can’t have been – indicates strong certainty that something was impossible. ‘She can’t have been at the party – she was abroad.’
Couldn’t have been – similar to can’t have been, expressing impossibility. ‘It couldn’t have been easy for them.’
Should have been – indicates something was expected or supposed to happen. ‘The meeting should have been yesterday.’
Would have been – describes a hypothetical past situation. ‘That would have been perfect timing.’
Verbs of Speculation and Uncertainty
Guess – to give an answer without being certain. ‘I guess it was around midnight.’
Suppose – to think something is probably true. ‘I suppose he was busy yesterday.’
Assume – to accept something as true without proof. ‘I assumed she was at work.’
Reckon – informal way to say you think something (British English). ‘I reckon it was about three o’clock.’
Think – to have an opinion or belief about something. ‘I think it was Tuesday.’
Believe – to feel certain something is true. ‘I believe he was telling the truth.’
Doubt – to feel uncertain about something. ‘I doubt it was her – she doesn’t live here.’
Suspect – to think something is probably true, especially something bad. ‘I suspect he was lying.’
Imagine – to form an idea about what might have happened. ‘I imagine it was quite difficult.’
Wonder – to want to know about something uncertain. ‘I wonder if it was the right decision.’
Adjectives Expressing Certainty Levels
Certain – completely sure about something. ‘I’m certain it was Monday.’
Sure – confident that something is true. ‘I’m not sure it was him.’
Positive – very confident about something. ‘Are you positive it was red?’
Confident – feeling sure about your belief. ‘I’m confident she was there.’
Unsure – not confident about something. ‘I’m unsure about the exact time.’
Unclear – not definite or easy to understand. ‘The situation was unclear.’
Vague – not clear or detailed. ‘My memory is vague about that day.’
Definite – fixed and certain. ‘There’s no definite answer.’
Probable – likely to be true or to happen. ‘That’s the most probable explanation.’
Possible – able to happen or be true. ‘It’s possible he forgot.’
Impossible – cannot be true or happen. ‘That’s impossible – he was with me.’
Likely – probable or expected. ‘It’s likely she missed the bus.’
Unlikely – not probable. ‘It’s unlikely he was involved.’
Nouns Related to Speculation
Speculation – the act of guessing about something. ‘That’s just speculation – we don’t know for sure.’
Uncertainty – the state of not being sure. ‘There’s a lot of uncertainty about what happened.’
Certainty – the state of being completely sure. ‘We need more certainty before deciding.’
Guess – an attempt to answer without being sure. ‘That’s just a guess.’
Assumption – something you accept as true without proof. ‘We’re working on the assumption it was an accident.’
Theory – an idea that explains something. ‘My theory is that she was late because of traffic.’
Hypothesis – a suggested explanation that needs testing. ‘The hypothesis was that he forgot.’
Explanation – a statement that makes something clear. ‘What’s your explanation for what happened?’
Alternative – another possibility. ‘There’s an alternative explanation.’
Conclusion – a judgment reached after thinking. ‘The conclusion was that it was an error.’
Deduction – a conclusion based on logic. ‘By deduction, it must have been the manager.’
Inference – a conclusion based on evidence and reasoning. ‘The inference is that she was upset.’
Useful Adjectives for Describing Theories
Reasonable – fair and sensible. ‘That’s a reasonable assumption.’
Plausible – seeming likely to be true. ‘It’s a plausible explanation.’
Feasible – possible and practical. ‘That theory is feasible.’
Conceivable – able to be imagined or believed. ‘It’s conceivable he was mistaken.’
💬 Dialogue 2: The Mystery Guest
Friends discussing who was at a party they didn't attend
3 🔗 Common Collocations & Idioms
It’s your best guess – used when you’re giving an answer but you’re not completely sure. ‘When did she leave? Around 3pm – but that’s just my best guess.’
I wouldn’t bet on it – means you think something is unlikely to be true. ‘Was he at the meeting? I wouldn’t bet on it – he usually skips them.’
That’s anyone’s guess – indicates that nobody really knows the answer. ‘Where was he last night? That’s anyone’s guess – he didn’t tell anyone.’
Your guess is as good as mine – means you don’t know any more than the other person. ‘Why was she angry? Your guess is as good as mine – I have no idea.’
Take a wild guess – to guess when you have very little information. ‘I’ll take a wild guess and say it was around midnight.’
In all likelihood – means something is very probable. ‘In all likelihood, he was stuck in traffic.’
4 👀 Grammar Spotlight
When expressing uncertainty about the past, two main grammatical patterns emerge. The past simple with adverbs like maybe or perhaps creates straightforward speculation: ‘Maybe it was John’ or ‘Perhaps she forgot the keys’. This structure is common in casual conversation and follows normal past tense rules. The modal perfect structure (modal verb + have + past participle) offers more sophistication: ‘It might have been John’ or ‘She may have forgotten the keys’. This pattern allows for negative forms (‘can’t have been’, ‘couldn’t have been’) and works smoothly in complex sentences. Adverbs of certainty like ‘definitely’, ‘probably’, and ‘possibly’ can strengthen or weaken your claims: ‘She definitely was there’ versus ‘She possibly was there’. The choice between these structures often depends on formality and the complexity of what you’re expressing. ‘Maybe it was wrong’ sounds natural in conversation, while ‘It may have been wrong’ suits written reports or formal discussions.
5 😊 Expressive Range
Mastering both simple and complex speculation structures dramatically expands your expressive power in English. When you can move fluidly between ‘Maybe it was a mistake’ and ‘It might have been a misunderstanding’, you’re showing linguistic maturity. The vocabulary in this semantic field – from verbs of speculation like ‘suppose’ and ‘reckon’ to adjectives of certainty like ‘plausible’ and ‘feasible’ – allows you to express subtle differences in how confident you feel. Using idiomatic expressions like ‘your guess is as good as mine’ makes you sound more natural, while modal perfect structures help you sound more educated and formal when needed. This range is particularly valuable in professional settings, academic discussions, and any situation where you need to discuss past events diplomatically without making absolute claims. The ability to speculate effectively shows you can think critically and communicate nuanced ideas about what might have happened.
🔍 Grammar & Structure Focus
Past Simple
Form: Maybe/Perhaps + subject + past simple verb
- “Maybe it was a misunderstanding.”
- “Perhaps she was busy yesterday.”
- “Maybe he forgot about the appointment.”
- “Perhaps they were late because of traffic.”
⚠️ Common Error: Learners sometimes use present tense instead of past: 'Maybe it is wrong' instead of 'Maybe it was wrong'. Remember the speculation is about the past, so use past tense verbs.
Modal Perfect
Form: Subject + modal verb (may/might/could) + have + past participle
- “It might have been a mistake.”
- “She may have forgotten about the meeting.”
- “He could have been stuck in traffic.”
- “They must have been surprised.”
- “She can't have been at home – I called several times.”
- “It couldn't have been easy for them.”
⚠️ Common Error: Learners often forget 'have' and say 'might been' instead of 'might have been'. Also, they sometimes use the wrong participle form: 'could have went' instead of 'could have gone'. Remember: modal + have + past participle (third form).