Depending on the object you can agree with, on, about or to something. All of these prepositions can be connected to a noun, so the nature of the object decides the appropriate preposition. Here’s which is which:
Agree with someone or something
You agree with someone or something when you share or accept an opinion.
- Paul said climate change is a real thread. I agreed with Paul.
You can also agree with the way something is done, particularly when that method is a matter of opinion or style. This means agree with can be followed by a method/style of doing something, or by an idea or overall concept that represents that.
- I don’t agree with the way they run this office.
- She agreed with the idea to rehome the dogs.
- We agreed with the government’s new measures.
Agree on a topic or subject
You agree on a topic or subject that you share a mutual view on. This may be combined with agreeing with someone, to say that you agree with someone on something. You about can also be used in this way.
- Jim and Hilda agreed on where to eat.
- The truck drivers agreed on the best route to Belgium.
- Kyle agreed with Mandie on the terms of their contract.
- We agree about everything.
Agree to an action or conclusion
You agree to do something, so to often connects agree to verbs in noun form. You can also agree to an agreement (most commonly rates, amounts and quantities).
- I agree to cutting my hair.
- They agreed to cook the dinner early.
- The public did not agree to higher taxes.
- She agreed to a pay cut.
Agree without a preposition
Agree can be used with that when you agree about an idea represented by a clause, instead of simply a noun. Sometimes, that can be optional, so agree can be used without a preposition. This form is usually for opinions or points.
- I agree that the cows in that field are getting fat.
- He agreed it is too late to eat more pizza.