To agree is to have the same ideas and opinions.
Agree can be followed by the prepositions with, about, on and to.
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.
- I agree with you.
- I entirely agree with your opinion that smoking must be banned.
- I could not agree with those nasty remarks she made about the unemployed.
- I do not agree with their aggressive sales policy.
You can use an -ing form after agree with.
- As a concerned parent, I agree with increasing the legal drinking age. (NOT I agree increasing the legal drinking age.)
- I agree with providing free education to the poor.
We agree about a subject of discussion.
- We agree about most things.
- They were quarreling the whole time they were together because they could not agree about anything.
Agree can be followed by a that-clause.
- We all agree that poverty must be eradicated.
- They agreed that the money should be equally divided among the four brothers.
We agree on a matter for decision.
- The ministers all agree on the need for building better infrastructure in the city.
- They could not agree on a date.
To agree to do something is to express your willingness to do it.
- The police inspector agreed to look into the matter.
- He agreed to feed the dogs.
- In the end I agreed to clean the room.