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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."
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.
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."
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?"
I guessand 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.
See also: guess
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.
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.
See also: guess
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.
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.
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]