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By the time you recieve this letter I will have finished my final exams.
He was writing 3 reports on an accident when his mother called.
I don’t think I will have done these exercises by 3 o’clock.
He was looking forward to a good meal at home, but Jill had gone out.
Your house looks nice. Did you paint it?
After we had discussed all details on the phone I wrote a letter about it.
Before my 18th birthday I haven't been out of England.
It is the easiest job I have ever had.
I feel better after I have taken the medicine.
I haven't been there for ages.
She will have tidied up the flat before he comes.
I was late. The teacher had already given a quiz when I came into the classroom.
The workers will have shipped the goods before the telegram arrives.
I am here for an hour. Where have you been?
When I got to the station, the 9 o’clock train had already left.

1) I will have finished
2)He had written
3)I will have done
4)had gone out
5)Have you painted it?
6)Had discussed
7)I had not been
8)I have ever had
9)had taken medicine
10)have not been
11)had titied up
12)had already given
13)had shiped
14)have have you been
15)had aready left

Если не ошибаюсь, то в самом задании есть ошибки. Ты либо его списал неправильно, либо реально задание с ошибками

1) I will have finished
2)He had written
3)I will have done
4)had gone out
5)Have you painted it?
6)Had discussed
7)I had not been
8)I have ever had
9)had taken medicine
10)have not been
11)had titied up
12)had already given
13)had shiped
14)have have you been
15)had aready left

By the time you recieve this letter I will have finished my final exams.
He was writing 3 reports on an accident when his mother called.
I don’t think I will have done these exercises by 3 o’clock.
He was looking forward to a good meal at home, but Jill had gone out.
Your house looks nice. Did you paint it?
After we had discussed all details on the phone I wrote a letter about it.
Before my 18th birthday I haven't been out of England.
It is the easiest job I have ever had.
I feel better after I have taken the medicine.
I haven't been there for ages.
She will have tidied up the flat before he comes.
I was late. The teacher had already given a quiz when I came into the classroom.
The workers will have shipped the goods before the telegram arrives.
I am here for an hour. Where have you been?
When I got to the station, the 9 o’clock train had already left.

В задании есть опечатки