1. We (wait) for her for 30 minutes.
-> have been waiting
2. She (go) out since 5 a.m.
-> has gone
3. They (not eat) anything all the morning.
-> have not eaten
4. The street is full of water because it (rain) for 3 hours.
-> has been raining
5. She looks very exhausted because she (work) all night.
-> has been working
6. I (read) this book since last night.
-> have read
7. She (chat) with her friend all the day.
-> has been chatting
8. He (talk) on the phone for hours.
-> has been talking
9. She (cycle) for 2 hours and she is very tired now.
-> has been cycling
10. We (not write) to each other for 6 months.
-> haven't written

1. We (wait) for her for 30 minutes.
--> have waited
( có từ "for" nhận biết cho thì hiện đại hoàn thành)
2. She (go) out since 5 a.m.
--> has gone
( có từ "since" cũng là từ nhận biết cho thì hiện tại hoàn thành)
3. They (not eat) anything all the morning.
--> didn't eat
( Dựa theo nghãi để chia thì: họ đã không ăn gì nguyên một buổi sáng)
4. The street is full of water because it (rain) for 3 hours.
--> has rained
5. She looks very exhausted because she (work) all night.
--> worked
( dựa theo nghĩa để chia thì: cô ấy trông kiệt sức vì cô ấy đã làm việc cả buổi tối)
6. I (read) this book since last night.
--> have read
7. She (chat) with her friend all the day.
--> chatted
( Dựa theo nghĩa để chia thì: Cô ấy đã "chat" với bạn cả ngày)
8. He (talk) on the phone for hours.
--> has talked
( có từ "for" nhận biết cho thì hiện đại hoàn thành)
9. She (cycle) for 2 hours and she is very tired now.
--> has cycled
( có từ "for" nhận biết cho thì hiện đại hoàn thành)
10. We (not write) to each other for 6 months.
--> haven't written
( có từ "for" nhận biết cho thì hiện đại hoàn thành)