Помогите сделать 4, 6 7 упражнения пожалуйста

4.
1. She has just gone out. - She left...
2. We haven't solved the problem yet.
3. When has it all happened? (Вообщем-то здесь, по идее, обязано употребляться Past Simple, т. к. спрашивается "Когда", но...)
4. ... since 10 o'clock the weather was changing...
5. She has had...
6. He has been ... he left school.
7. How long have you lived...

6.
1. A great variety of materials used by builders nowadays.
2. Prefab panels constantly produced by this firm.
3. These buildings has been designed by...
4. Very many irrigation systems were built and modernized.
5. It will be forgotten soon.

7.
1. They want us to sent them a telegram.
2. I want you to wait here.
3. He expest that his daughter will become an architector/He expects his daughter to become an architector.
4. She wants her to be invited to the evening.
5. The teacher want students to learn the rules.
6. My mother didn't want me to spill the milk.
7. The woman wanted her daughter to go to a university.