`1`. The letter should be sent immediately.
`->` Câu bị động với "should": S + should be + Vpp
`2`. My brother is studying hard so as not to fail the final exam.
`->` so as not to + Vinf: để mà không .....
`3`. He told me that he was a student.
`->` Câu trần thuật: S + told + O + that + S2 + V lùi thì
`4`. Nam asked Lan if she liked listening to music.
`->` Câu trần thuật yes, no: S + asked + O + if + S2 + V lùi thì
`5`. He is the most interesting person that I have (ever) talked.
`->` So sánh nhất + that + hiện tại hoàn thành
