1.agree with=have the same opinion as,e.g:I agree with you/your opinion/what you said
2.agree to=be willing to accept or allow sth,e.g:The bank manage agree to accept our request for a loan.
注：后接sb,用agree with一定正确.后接sth,用agree to不一定正确.
3.agree on,指对某方面达成一致意见
4.agree in,指在某个方面同意