1.agree with
①表示同意某人或某人的意见、想法、分析、解释等 (即持同一观点)：
I don’t agree with you.
我不同意你的意见.
I agree with what you say.
我同意你说的.
②表示“ (食物、天气、工作等)对…适宜”：
The weather doesnot agree with me.这种天气对我不适宜.
③表示“与…一致”：
What he does does not agree with what he says.
他言行不一致.
2.agree to
①主要用来表示一方提出一项建议、安排、计划等,另一方同意协作：
We agreed to their arrangement.
我们同意了他们的安排.
She agreed to marriage.她同意结婚.
有时 agree to 也可用来表示“答应”一件自己不愿做的事：
I was forced to agree to it,but at heart I didn’t quite agreewith it.
我被迫答应,但内心并不完全同意.
②后接 suggestion,plan,proposal 等名词时,与 accept 同义：
Do you think he will agree to (=accept) my suggestion?
你认为他会同意 (接受)我的建议吗?
③其后既可接动词原形 (此时to是不定式符号),也可接动名词 (一般有逻辑主语,此时 to是介词)：
He agreed to go with us.
他同意同我们去.
I never agreed to Mary marrying him.我从来没同意玛丽嫁给他.
3.agree on [upon]
①主要指双方通过协商而取得一致意见或达成协议：
We agreed on the price.
我们就价格达成了一致意见.
Both sides agreedon these terms.
双方都同意这些条件.
②后接动名词 (=agree to do sth)：
He agreed on lending (=to lend) us some money.
他同意借给我们一些钱.
Mary agreed oncoming [to come] on Monday.
玛丽同意星期一来.
