Agree With vs. Agree About vs. Agree To vs. Agree On

To agree is to have the same ideas and opinions.

Agree can be followed by the prepositions with, about, on and to.

Agree with

We agree with a person, an opinion or a policy. To agree with something is to think that it is the right thing to do. To agree with somebody is to think that they are doing or saying the right thing.

You can use an -ing form after agree with.

Agree about

We agree about a subject of discussion.

Agree can be followed by a that-clause.

Agree on

We agree on a matter for decision.

Agree to

To agree to do something is to express your willingness to do it.