①同意
I agree with/to/on
That’s a good point
→I agree to this decision, but not to refuse any refund.
②大賛成
I couldn’t agree more
You can say that again
→I couldn’t agree more you shouldn’t invest
to stock markets now.
③ほぼ同意
I suppose
I think I agree with you
→I suppose the decision that your school has decided to postpone.