英语改写句子 100分

1 is ... cost
2 Neither ... is a
3 It ... to
4 To
5 did't come ... until
6 how to
7 not walk
8 been on

.How much does the parcel cost (基本保持原意
How much _is____the__cost___for the parcel
2.Both of his parents are doctors (改为否定句)
_Neither of his parents is a doctor
3.To learn English well is not so easy(基本保持原意)
It is not easy to learn english well
4.It is very important to learn how to count(基本保持原意)
To_learn how to count is very important
5.my brother went to bed after Mum came back (基本保持原意)
My brother didn't go to bed until Mum came back
6. Can you tell me how i can get to the post office?(基本保持原意)
Can you tell me how to get to the post office?
7Youd better go to school on foot(改为否定句)
You better not go to school
8The movie began ten minutes ago(基本保持原意)
the movie has been on for ten minutes