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Используйте паст симпл(настоящее прошедншее время was were+V2(ed) и Рресент перфект(настоядее завершенное)(have has+V3)(ed)
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1 there are
2 there is
3 there is
4 is there
5 there are
6 there are
7 are there
8 are there
9 there are
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2 the smallest
3 colder than
4 dirtier than
5 more expensive than
6 the most expensive
7 the worst thing of all
8 the most horrible
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2 very
3 much
4 much
5 very
1) If I am here I will help you.
If I was here I would help you.
If I had been here, I would have helped you.
2) If it is possible we will begin this work at once.
If it was possible we would begin this work at once.
If it had been possible, we would have begun this work at once.
3) If she has all the necessary books she will make her report in time.
If she had all the necessary books she would make her report in time.
If she had had all the necessary books, she would have made her report in time.