the car breaks down so often because you don't take good care of it ->if

`—` If you took good care of the car, it wouldn't break down so often.

`->` ĐK`2`: If + S + Ved/were + O, S + would/could + V.

`->` Nếu bạn giữ gìn tốt chiếc ô tô, nó sẽ không bị hỏng thường xuyên.