Question

Open the brackets using Present Perfect Continuous.
1) He (to try) to solve this problem for several months now but he hasn't found a solution yet.
2) He (to teach) at school for twenty years.
3) Mr. Smith (to work) in his room since early morning.
4) The children (to sleep) for 5 years.​

Answer 1

Ответ:

He has been trying

He has been teaching

Mr. Smith has been working

have been sleeping

Объяснение:

незаконченное Действие, которое продолжается с прошлого до сих пор  на протяжении времини