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I suppose (so)

An expression of vague affirmation or assent. A: "It's starting to get dark out, should we start heading home?" B: "I suppose so." Bob: "You look a little down today. Everything alright?" Mary: "I suppose. I've just been feeling vaguely melancholy lately."
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I don't suppose you

A polite way of introducing a request to someone for something you want or would like for them to do. Often followed by "could" or "would." I don't suppose you have a pen? Mine just ran out. I don't suppose you could bring this to Johnny tomorrow, could you? He needs it back, but I'm going to be at a dentist appointment. Hey, Mom? I don't suppose you would go over this math problem with me? I just can't get my head around it.
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Suppose I do?

What would the consequences be if I did (whatever the other person just mentioned)? Implies that the speaker either believes they are right to do something, or else they are suspicious of the other person questioning them about it. A: "Your team isn't actually going to present that plan to the board, are you?" B: "Suppose we do? It may be a little unconventional, but they'll see that we are right." A: "So, what, you're going to just hop on a plane to Europe and show up on her front door?" B: "Suppose I do? I've always wanted to go to Europe, and at least then I'll know for sure how she feels."
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Suppose I don't?

What would the consequences be if I did not do (whatever you just mentioned)? Implies that the speaker either believes they are right not to do something, or else they are suspicious of the other person questioning them about it. A: "I'm warning you for the last time to take that money to the bank and deposit it!" B: "And suppose I don't? What exactly are you going to—report me to police?" A: "We need to report those earnings so we can pay taxes on them later." B: "Suppose we don't, though? Would anyone ever find out about it?"
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I guess

 and I expect; I suppose; I suspect 
1. a phrase that introduces a supposition. (Frequently, in speech, suppose is reduced to 'spose, and expect and suspect are reduced to 'spect. The apostrophe is not always shown.) Bob: I guess it's going to rain. Bill: Oh, I don't know. Maybe so, maybe not. Alice: I expect you'll be wanting to leave pretty soon. John: Why? It's early yet.
2. a vague way of answering 'yes'. John: You want some more coffee? Jane: I 'spose. Alice: Ready to go? John: I spect.
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I guess not.

 and (I) don't think so.; I expect not.; I suppose not.; I suspect not.; I think not.
a vague statement of negation. (More polite or gentle than simply saying no. Frequently, in speech, suppose is reduced to 'spose, and expect and suspect are reduced to 'spect. The apostrophe is not always shown.) Bill: It's almost too late to go to the movie. Shall we try anyway? Mary: I guess not. Tom: Will it rain? Mary: I 'spect not.
See also: guess, not

I guess (so).

 and I believe so.; I expect (so).; I suppose (so).; I suspect (so).; I think so.
a vague expression of assent. (Frequently, in speech, suppose is reduced to 'spose, and expect and suspect are reduced to 'spect. The apostrophe is not always shown.) Tom: Will it rain today? Bob: I suppose so. Sue: Happy? Bill: I 'spect. Sue: You don't sound happy. Bill: I guess not.
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Suppose I do?

 and Supposing I do?
Inf. And what does it matter if I do? What are you going to do about it? Alice: Do you really think it's right to do something like that? Sue: Suppose I do? Fred: Are you going to drive up into the mountains as you said you would? Sally: Supposing I do? Fred: I'm just asking.
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Suppose I don't?

 and Supposing I don't?
Inf. And what will happen if I don't? (Said as a sort of threat. Not usually with question intonation.) Bill: You'd better get yourself over to the main office. Tom: Suppose I don't? Father: You simply must do better in school. Tom: Supposing I don't? Father: Your clothing and personal belongings will be placed on the curb for the garbage pickup, and we will have the locks changed. Next question.
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I suppose so

I reluctantly agree, I guess so, as in Do you want tickets to the concert?-I suppose so, or Do you think it's going to rain?-I suppose so. [Mid-1500s]
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I don’t suppose you could...

used as a very polite way of asking somebody to do something for you: I don’t suppose you could carry this bag for me, could you?
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I supˈpose so

used for showing that you agree but you are not happy about it: ‘Can I borrow the car?’ ‘Yes, I suppose so, but be careful.’‘Can I invite him to the party?’ ‘I suppose so.’
See also: suppose
References in classic literature ?
On the contrary, we shall suppose that, although Freudian "repression" undoubtedly occurs and is important, it is not the usual reason for unconsciousness of our wishes.
They suppose that when wishes are repressed they are repressed into the 'unconscious,' and that this mysterious censor stands at the trapdoor lying between the conscious and the unconscious.
It is therefore natural to suppose that, what ever may be the correct definition of "consciousness," "consciousness" is not the essence of life or mind.
Just the kind of girl I should suppose likely to captivate poor Edward.
And you may suppose that I have repeated the remainder of your tale of horrors.
Did you ever suppose you'd see the day when you'd be adopting an orphan girl?
As there is always more time and better opportunity to tamper with a standing body of magistrates than with a jury summoned for the occasion, there is room to suppose that a corrupt influence would more easily find its way to the former than to the latter.
It is natural to suppose that they are hitherto more attached to their own, and that each would struggle for the preference.
The examples of innovations which contract its ancient limits, as well in these States as in Great Britain, afford a strong presumption that its former extent has been found inconvenient, and give room to suppose that future experience may discover the propriety and utility of other exceptions.
THE semi-final of the Capital One Cup Our Blues and Reds are leading one up Are Wembley Gates beckoning wide For football fans from Merseyside With a lot of grit and a little luck We could both have one hand on the cup Will there be a Derby date Or will the swinging hand of fate Decide not to push our luck Putting Stoke and City up for the cup But, suppose the Reds without their crocks Put Stoke to the sword in front of the Kop And suppose the Blues of Merseyside Brush those other Blues aside So cross your fingers and your toes And wish it's for real not just suppose Should our Derby dreams come true?
I suppose we're at it the last few years," acknowledges Nolan, now in his seventh year on the panel, with regard to his battle with Maguire.
Suppose they move so slowly we hardly know they're alive
1 : to think of as true or as a fact for the sake of argument <Let's suppose you won.
I suppose as long as I was ignorant of Canon law rules, he was free to manipulate "procedural norms.
Let's suppose that the federal government analyzed a substance (in this case, mint candies) and issued safety guidelines about those candies.