Dave fell off the roof of the barn. Father and i had built it last summer. ( relative clause)
2 câu trả lời
Dave fell off the roof of the bar which Father and i had built last summer. ( mệnh đề quan hệ thay thế cho vật => dùng which )
⇒Which
⇒Dave fell off the roof of the bar which Father and i had built last summer.
⇒Để thay thế cho vật thì ta dùng which
$#lam$
