Task 1.
1. It has been raining for two hours.
2. I have been learning Spanish since December.
3. Ann has been looking for a job for six months.
4. Mark has been working in London since last year.
5. They have been living in this house for two years.
Task 2.
1. How long has it been raining?
2. How long have you been learning Spanish?
3. How long has Ann been looking for a job?
4. How long has Mark been working in London?
5. How long have they been living in this house?
Task 3.
1. I have been going to school for nine years.
I have been going to school since 2008. (возможные вариант)
2. I have been learning English for two years.
I have been learning English since 5th grade. (возможные вариант)
