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was
was
There
were
名词单数
名词复数
不可数名词
I was a student two years ago.
He was at home yesterday.
You were a worker.
There was a book.
My friends were friendly.
There were many students.
There was bread on the table.
I am a student.
I am not a student.
She is happy.
She is not happy.
She isn’t happy.
There is a book
There is not a book
There isn’t a book
There are students.
There are not students.
There aren’t students.
They are at home.
They are not at home.
They aren’t at home.
be 动词的过去式
原形