四、句型转换。

15.Why don’t you ask your teacher for help?（改为同义句）             ask your teacher for help?

16.It’s time for breakfast.（改为同义句）It’s time                    .

17.He would like to offer us some help.（改为同义句）He would like to      some help     us.

18.I think he should tell the news to his father.（改为否定句）I                           tell the news to his father.