I guess so vs Maybe vs Perhaps

When to use each in English, with meaning, register, and examples.

I guess so

InformalTop 3,000 (common)

Maybe

Top 2,000 (common)A1adverb

Perhaps

Top 1,000 (very common)A2adverb
Most common: Perhaps
 I guess soMaybePerhaps
Pronunciation🇬🇧 //aɪ ɡɛs səʊ//🇺🇸 //aɪ ɡɛs soʊ//🇬🇧 /["/ˈmeɪbi/"]/🇺🇸 /["/ˈmeɪbi/"]/🇬🇧 /["/pəˈhæps//præps/"]/🇺🇸 /["/pərˈhæps/"]/
MeaningIt's a way of saying you agree to something uncertain.possibly; it's uncertainmaybe; it might be true
ExampleAre you coming to the party tonight? I guess so.Maybe we can go to the park later.‘Are you going to come?’ ‘Perhaps. I'll see how I feel.’
RegisterInformalNeutralNeutral
How commonTop 3,000 (common)Top 2,000 (common)Top 1,000 (very common)
CEFR level-A1A2
Part of speechadverbadverb
CollocationsI guess so, I guess not, I guess that's truemaybe later, maybe not, maybe yes, maybe once, maybe tomorrowperhaps we should, perhaps it is, perhaps he thought
AntonymsI don't think so, I doubt it, I disagree, Definitely notdefinitely, certainlydefinitely, certainly
Common mistakesUsing in formal settings where more certainty is needed., Saying it too emphatically, making it sound definite., Omitting other responses that could clarify uncertainty.Confusing 'maybe' with 'may be' (two words) which has a different meaning., Overusing 'maybe' in formal writing instead of stronger alternatives., Using 'maybe' when more definitive language is expected.'Perhaps' can't be used as a noun., Confused with 'perchance', which is more archaic., Using 'perhaps' in very direct or commanding statements.
Usage notesUse this when you're not fully certain but lean towards an agreement. Avoid in formal conversations.Use 'maybe' to express uncertainty or possibility. It's neutral and can be used in both spoken and written contexts, though avoid it in very formal situations.Use 'perhaps' in formal writing or speech. It's less common in casual conversations, where 'maybe' is preferred. Avoid using it when being certain.

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I guess so
Maybe
Perhaps

Frequently asked questions: I guess so vs Maybe vs Perhaps

What's the difference between I guess so, Maybe, and Perhaps?

I guess so: It's a way of saying you agree to something uncertain. Maybe: possibly; it's uncertain Perhaps: maybe; it might be true

Which is more common: I guess so, Maybe, and Perhaps?

Perhaps is the most common in everyday English.

Which is more advanced: I guess so, Maybe, and Perhaps?

Perhaps is the highest level, at A2, on the CEFR scale.

Can you show an example of each?

I guess so: Are you coming to the party tonight? I guess so. Maybe: Maybe we can go to the park later. Perhaps: ‘Are you going to come?’ ‘Perhaps. I'll see how I feel.’

Can I use I guess so, Maybe, and Perhaps interchangeably?

Not always. I guess so, Maybe, and Perhaps are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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