2. The weather is cold at present.

=> Hiện tại tiếp diễn

=> dấu hiệu: at present.

3. Up to now, she has writen three books.

=> Hiện tại hoàn thành

=> Dấu hiệu: up to now.

4. Nigel has been in business since he finished studying.

=> Hiện tại hoàn thành

=> Dấu hiệu: has been

5. Celine doesn't feel good. She catched a cold a couple of two days ago.

=> Qúa khứ đơn

=> Dấu hiệu: two days ago.

6. We owned the car for 6 months before we discovered it was stolen.

=> Qúa khứ đơn.

=> Dấu hiệu: before

7. By the time you see my children next year, you will forget what they look like.

=> Vế 2: Tương lai đơn

=> Dấu hiệu: By the time.

8. This man has stolen over 600 laptops from Ministry of Defence staff over the past 5 years.

=> Hiện tại hoàn thành

=> Dấu hiệu: over the past 5 years.

9. Supposing they had closed the road, would that have been a good idea?

=> Hiện tại hoàn thành

=> Dấu hiệu: have been.

10.  It is often hot in the summer.

=> Động từ to be: am, is are

=> I:am; is: he, she, it, danh từ số ít; are: they, you, we, danh từ số nhiều.

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