1 Would you mind if I borrowed your ruler? ( Would you mind if I + V2/ed )
2 You should give up smoking. ( should + Vinf = ought to + Vinf )
3 The girl reading a book is Lan. ( câu rút gọn mang nghĩa chủ động dùng - Ving )
4 I always keep the window open so as to let fresh air in. ( so as to + Vinf: để mà )