Dear penpal, thanks for you last letter! i'm sorry i haven't written so long,but i haven't got any free time. well,in your letter you told me about christmas in england. it is very interesting,i think. thank you so much for the invitation, I really appreciate it,but I’m afraid I’m not able to come,I’ve got too much on at the moment. but i hope,that i will celebrate this holiday with you next year. So, i have to go now,i have promised my mom to help her with the housework. hope to hear from you soon! yours, penpal.
Dear penpal, thanks for you last letter! i'm sorry i haven't written so long,but i haven't got any free time. well,in your letter you told me about christmas in england. it is very interesting,i think. thank you so much for the invitation, I really appreciate it,but I’m afraid I’m not able to come,I’ve got too much on at the moment. but i hope,that i will celebrate this holiday with you next year. So, i have to go now,i have promised my mom to help her with the housework. hope to hear from you soon! yours, penpal.
2 - won`t have to
3 - didn`t have to
4 - won`t have to
5 - didn`t have to
6 - doesn`t have to
7 - don`t have to
8 - has to
9 - had to
10 - has to
11 - have to
12 - won`t have to
13 - have to
14 - had to
2 - can
3 - could
4 - would
5 - couldn`t
6 - shouldn`t
7 - needn`t
8 - could
9 - would
10 - can; can`t
11 - needn`t
12 - can; can
13 - mustn`t
14 - should
15 - can