1.i have to study hard.

=>i wish ....i didn't have to study hard.........

2.we had a lot of homework yesterday.

=>i wish .....we hadn't had a lot of homework yesterday.............

3.it is raining heavily.

=>i wish......it weren't raining heavily......

4.it was cold last night.

=> i wish.......it hadn't been cold last night...........

5.they work slowly

=>i wish........they didn't work slowly....

6.she doesn't join in the trip.

=>i wish..she joined in the trip....

7.i am not good at english.

=>i wish.i were good at english....

8.he studies badly.

=>i wish...he didn't study badly........