agree with sb.------同意某人的观点，建议

agree to sth-------同意对方开出的条件

agree on sth-----同意双方制定的协议条款，合同

1 Do you agree with me

2 He didn't get the job because he didn't agree to the working conditions here.

3 They agreed on the contract and signed their names.

4 agree to do sth ------同意做某事

5 allow sb to do sth.------同意他人做某事