I don't speak French that well
Я не так хорошо говорю по-французски, как ты.
I don't speak French as well as you do.
Я не так хорошо говорю по-французски.
I don't speak French that well.
Я не так хорошо говорю по-французски, как Том.
I don't speak French as well as Tom does.
Я не так хорошо говорю по-французски, как хотелось бы.
I don't speak French as well as I'd like to.