1.You don't have to worry about your homework.
You __needn't____worry about your homework.
2.They are able to read books in easy English.
They _can____read books in easy English.
3.Do you have a new computer?
__Have__you got a new computer?
4.What time is it ,do you know?
___What's___the time ,do you know?
5.How long are you going to stay here?
How long are you gong to __be___here?
6.He says,"Do it by yourself.''
He ____asks____me to do it by myself.
7.It's late.I must be off now.
It's late.I must ___leave___now.