Question

Add the future perfect continuous tense of the verbs given in brackets :
1. They ........ for us for an hour when we reach there.
(wait)
2. She ......... a picture for fifteen minutes when you contact her. (paint)
3. They ......... to solve these questions for two hours before they are able
to solve them.
(try)
The peon ......... the bell for two minutes before the students assemble. (ring)
policemen .......... for the thief for a few days before they are able to
arrest him.
(search)​

Answer 1

Answer:

1. Will have been waiting

2. Will have been painting

3. Will have been trying

4. Will have been ringing

5. Will have been searching

Explanation:

In modern English, we can use 'will' with any subject.