Using the right preposition (voorzetsel) with the right word is difficult at the best of times, but it is particularly difficult in the case of agree, with which you can use to, with, about, on or no preposition at all – depending on what you want to say. The sentences below show the possibilities:
When you agree to a proposal, you accept it and say that you will carry it out, or let someone else carry it out.
When you agree with a person or an idea, you are of the same opinion or have the same idea.
When you (as a group) agree about something, you are of the same opinion.
When you agree on a plan, you decide jointly with others to do something.
When you agree a deal or price, you reach joint agreement about it.
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