doubt it for a moment

I do not doubt the sincerity of your arguments

I do not exactly understand you

I do not feel sure that I entirely share your views

I don't feel that it is my business

I do not find it an unpleasant subject

I don't insist on your believing me

I don't justify my presumption

I don't know quite why you should say that

I don't know that I can do that

I don't know when I have heard anything so lamentable

I don't know why you should be displeased

I don't make myself clear, I see

I don't pretend to explain

I don't see anything particularly wonderful in it

I don't underrate his kindness

I don't want to disguise that from you

I don't want to exaggerate

I don't want to seem critical

I doubt the truth of that saying

I endorse it, every word

I entirely approve of your plan

I fancy it's just that

I fear I cannot help you

I fear that's too technical for me

I feel a certain apprehension

I feel an unwonted sense of gaiety [unwonted = unusual]

I feel it my duty to be frank with you

I feel myself scarcely competent to judge

I feel very grateful to you for your kind offer

I find it absorbing

I find it rather monotonous

I find this agreeable mental exhilaration

I frankly confess that

I generally trust my first impressions

I give my word gladly

I give you my most sacred word of honor

I had better begin at the beginning

I had no intention of being offensive

I hadn't thought of it in that light

I hardly think that could be so

I have a hundred reasons for thinking so

I have a peculiar affection for it

I have an immense faith in him

I have been constrained by circumstances

I have been decidedly impressed

I have been longing to see more of you

I have been puzzling over a dilemma

I have every reason to think so

I have given you the best proof of it

I have gone back to my first impressions

I have known striking instances of the kind

I have never heard it put so well

I have no delusions on that score

I have not succeeded in convincing myself of that

I have not the influence you think

I have not the least doubt of it

I haven't the remotest idea

I have often a difficulty in deciding

I have often marveled at your courage

I have quite changed my opinion about that

I have something of great importance to say to you

I have sometimes vaguely felt it

I have the strongest possib