改为被动语态和同义句
问题描述：
改为被动语态和同义句
They plant many trees on the hill every spring.
Many trees _______ on the hill every spring.
I have learned English for six years.（改为同义句）
It is six years ________ I ________ to learn Englis
Do you like playing football?They want to know.（变成一个句子）
They ________ ________ I like playing football.
答
are planted
since,started
ask whether