1. I have been working for the company for a year. 

2. D.H Lawrence, a famous novelist, is one hundred years old.

3. When did Catherina and Henry engage ?

4. I haven't seen him since I was a student.

5. Alan hasn't visited his parents for ages.

1 I have been working for the company for a year. ( hiện tại hoàn thành tiếp diễn )

2 D.H.Lawrence ,the famous novelist, was born one hundred years ago. ( mệnh đề quan hệ không xác định )

3 When did Catherine and Henry get engaged? 

4 I haven't seen him since I was a student. ( S + have/has + Vpp + since + S2 + Ved/2 )

5 Alan hasn't visited his parents for ages. ( S + have/has + Vpp + since + S2 + Ved/2 )