grammar(are/is)

no it is not

Anonymous Is it correct to say The thing I hate are dogs?

No. At the very least, use 'thing' with 'is' or 'things' with 'are'.

A little differently, you'll see both of these:

What I hate is dogs.
Dogs are what I hate.

You may also see What I hate are dogs, but it's much less likely you'll see Dogs is what

So it is also incorrect to say what I hate are dogs,right?

Anonymous So it is also incorrect to say what I hate are dogs,right?

Technically, it's incorrect, but it is accepted by many. If you say it in an ordinary everyday conversation, nobody is going to notice it as a bad mistake.

CJ

but I guess my teacher won't accept it

Anonymous but I guess my teacher won't accept it

I agree, if your teacher stringently insists on absolute perfection in grammar.

Anonymous but I guess my teacher won't accept it

Probably not, but only your teacher can answer that. Why not ask your teacher?

CJ