这组短语的共同意思是“赞同，同意”。它们的区别是：

(1)agree with (sb.)的含义是主观上“同意”，即“赞成”，with后常接表示人或意见、观点、想法、分析、解释等的名词或代词作宾语，表示“同意某人的意见、主意或所说的话”，但不含有协力合作的意思。当物作主语时，意思是“与……一致或相符，（食物，气候等）适合某人”，with的宾语通常是人；agree with不能用于被动结构。如：

I agree with you (what you said)．

我同意你（所说的话）。

As the author of the proposal I cannot agree with you.

我作为提案的发起人不能同意你的意见。

I agree with you to a certain degree.

我在某种程度上同意你的观点。

I agree with you up to a point.

我在某种程度上同意你的看法。

He silently agreed with much of what she had said.

对于她所讲的，有很多他暗自赞同。

He agreed with my suggestion that we should change the date.

他同意我提出的更改日期的建议。

He agreed with them about the need for change.

他同意他们需要变革的意见。

I agree with her analysis of the situation.

我赞成她对形势的分析。

He agreed with my opinions．

他同意了我的意见。

The great majority of people seem to agree with this view.

大多数人似乎都同意这种观点。

Not many people agree with the government's prediction that the economy will improve.

没有多少人赞同政府认为经济将会有所改善的预测。

I don’t agree with you.

我不同意你的意见。

We agreed with what he said at the meeting． 我们同意他在会上讲的话。

I don't agree with what they're doing.

我不赞同他们正在做的事情。

agree with（与…）相符，一致,吻合

Your account of the accident does not agree with hers.

你对事故的叙述与她的叙述不一致。

His second statement agrees with facts as stated by the other witnesses.

他的第二份供述与其他目击证人所陈述的事实相符。

not agree with sb

(of food 食物) 使难受；不适合；不相宜

I love strawberries, but they don't agree with me.

我喜欢草莓，但吃了以后不舒服。

I don't think the food here agrees with me.

我觉得这里的食物不对我的胃口。

agree with sb（地方、经历）适合，适宜，对…有益

You look great, Brian. The Bahamas certainly agree with you.

你看上去气色好极了，布赖恩。巴哈马显然很适合你。

(2) agree to用法如下：

①to作为介词，后面不能接人，只能接示建议、计划、安排、提议、办法之类的名词，表示“同意某项建议、计划、安排”等一类的名词或代词”。后接事，只表示“同意”，但未必“赞成”；常用结构：agree to (sth.)；agree to one’s doing sth意为“同意某人做某事”。如：

They have agreed to our plan．

他们已同意我们的计划。

I agree to the terms proposed.

我同意拟议的条件。

Do you think he'll agree to their proposal?

你认为他会同意他们的建议吗？

I'll agree to anything for an easy life.

只要有安逸舒适的生活我什么都同意。

They agreed to the changes on the understanding that they would be introduced gradually.

他们同意这些改革，条件是须要逐步进行。

They finally agreed to our terms with a certain reluctance.

他们最终有点勉强地同意了我们的条件。

It was no small achievement getting her to agree to the deal.

能让她同意那笔交易可是个不小的成就。

They agreed to the plan.

他们都同意这项计划。

The firm agreed to the terms.

公司同意这些条件。

②to作为动词不定式符号，其后跟动词原形，作“同意（答应）做某事”解。常用结构：

agree to do sth意为“同意做某事”；

agree to可以用于被动结构。如：

He agreed to pay me for the drawings.

他答应向我支付这些画的钱。

She finally agreed to have the wretched animal put down.

她最后同意用药结束这头可怜的动物的生命。

The government has agreed to lift restrictions on press freedom.

政府已经同意撤销对新闻自由的限制。

That director agreed to do the film.

那名导演同意拍那部电影。

You and I are going to have to agree to disagree then.

那你我只能各自保留不同意见了。

The government agreed to set up a committee of inquiry.

政府同意成立一个调查委员会。

The two groups agreed to cooperate with each other.

这两个组同意相互协作。

The government agreed to send a small token force to the area.

政府同意派遣一小支象征性的部队到那一地区。

My father agreed to buy a new pen for me．

父亲答应给我买支新钢笔。

She agreed to let me go early.

她同意让我早走。

She agreed (that) I could go early.

她同意让我早走。

(3)agree on/ about意为“对……达成一致意见”，指双方或多方“对某事有同样看法，在某一事情上达成共识”。相当于agree upon，可以用于被动结构。因此其主语通常为复数，宾语则是表示事情、计划等的名词，而不是表示人的名词或代词。如：

They all agree on the matter。他们在这个问题上意见一致。

Are we all agreed on this?

我们在这个问题上是不是全体意见一致？

We all agree on (making) an early start.

我们一致同意及早出发。

The warring sides have agreed on an unconditional ceasefire.

交战各方已经同意无条件休战。

The building of a new car factory was agreed on last month．

上月，就建一座新汽车厂之事达成了协议。

It was agreed (that) we should hold another meeting.

大家一致同意我们应该再开一次会。

agree on doing sth＝agree to do sth 同意做某事

Our teacher agreed on singing with us after school.＝Our teacher agreed to sing with us after school.

我们老师同意放学后和我们一起去唱歌。

(4)agree that作“认为……”解，其后跟宾语从句。例如：

I agree that your composition is very good．我认为你这篇作文写得好。

We agreed (that) the proposal was a good one.

我们一致认为这个建议不错。

She agreed to let me go early.

她同意让我早走。

She agreed (that) I could go early.

她同意让我早走。

Most people nowadays would agree that ability is more important than a diploma.

如今大多数人这么认为，能力比学历更重要。

注意以下句型：

It was agreed (that) we should hold another meeting.

大家一致同意我们应该再开一次会。

It was agreed that another round of preliminary talks would be held in Peking

经协商，新一轮的预备会谈将在北京举行。

Nearly a year later, it was agreed that Tom would be statemented.

近一年后，汤姆被批准将获得特殊教育。

Everyone is agreed that something needs to be done about the situation.

所有人一致认为需要采取措施改变这种局面。