Задание 9,Gramma in Use 7c .Spotlight, 11 класс, Английский язык,О.В. Афанасьева,ГДЗ

Не могу понять как выполнить ?
Sentence transformations
Complete the second sentence so that it
means the same as the first. Use the word in
bold. Use two to five words.
1     I think you should apologise to Mike.
were     If........... apologise to Mike.
2       I didn’t pass the course because I didn’t work
hard enough.
failed If I’d worked harder, I ...................  the
course.
3       It’s a pity she missed the party.
wish      I........... to the party.
4       I suggest that you leave now.
rather I............ now.
5       I wish she wouldn’t criticise me all the time.
stop      If........... criticising me!