tense
The earth （） smaller than the sun. （be）
is
He wrote the book
The book was written by him
They often（）this book。（read）
read
Their classroom is cleaned by the students every day.
The students clean their classroom every day.
I （）to the museum yesterday。（go）
went
We talked about the matter very often
The matter was very often talked about
We（）it now。（do）
are doing
The sports meeting was put off till next week by them.
They put off the sports meeting till next week
Everybody （） him. （know）
knows
We talked about the matter very often
The matter was very often talked about
（）you（）last year’s accident？（remember）
Did remember
Football is played all over the world.
People play football all over the world.
He（）his duty now（do）
is doing
We should follow the rules
The rules should be followed by us
He was go to the America last week。（变成一般现在时）
He goes to the America。
A road is being built.
The workers are building a road.
The book （） there ten minutes ago. （be）
was
should+verb
should be verb(perfect)
Did she know it？（改成过去式）
Does she knows it？
My friend lent me those books.
I was lent those books by my friend.