In the comments below a recent lesson, I noticed that several people had written "I'm agree with you". This is incorrect.
You can't say "I'm agree" in English. You must say "I agree".
I think this mistake is caused by people translating from their own languages. For example, I know that in French and Spanish, the verb 'be' is used when people want to say that they agree, so it looks something like "I am agree" or "I am agreed". It's not the same in English.
In English, we simply use 'agree' as a normal verb: I agree, I prefer, I like...