Люди помогите пожалуйста британский 8 класс Михеева Упр 24

Exercise 24.
1) If only the students hadn't missed the 8:45 train!
2) If only the Johnsons had arrived on time at the weekend!
3) If only Lucy hadn't posted the letter last Friday.
4) If only John had been at home when I phoned him!
5) If only it hadn't been that cold in Novosibirsk last winter!
6) If only the children hadn't quarreled yesterday!
7) If only my son hadn't lost the keys two days ago!
8) If only Betsy had cooked dinner yesterday!
9) If only the political situation in the country hadn't been so dangerous last August.
10) If only they hadn't stolen my new bicycle!