①くだけた不同意
Are you serious?
You must be joking
Don’t give me that
→You must be joking.There is no way you are going to business trip during the Coronavirus outbreak.
②配慮がある不同意
I’m sorry but
I hate to disagree but
→I hate to disagree but this product is completely out of date.
③保留する
I’m not sure about that
It’s hard to say
I wouldn’t like to say
→I wouldn’t like to say, I mean, we don’t know anything to happen in the future.
④興味を示す
Oh did you?/have you?/were you?