肯定回答：即不介意对方做某事时，常用not at all,certainly not,of course not等等。否定回答：即介意对方做某事时，常用I am sorry but...，I am afraid you can't....等等。
1.若表示“不介意”或“同意”时，常用否定形式，如：
①No,of course not.
②No,certainly not.
③No,not at all.
④No,go ahead.
⑤No,do as you like.
⑥No,indeed.
⑦No,please.
⑧No,I don't mind.
⑨No,do it please.
⑩Not in the least.
2.若表示“介意”或“不同意”时，则常用较委婉的方式加以拒绝，如：
①I'm sorry but I do.
②Sorry,you'd better not.
③I'm afraid you can't.
④I wish you wouldn't….
⑤I'm sorry,but it's not allowed….
⑥Yes,I do mind.