1樓：
i was a student last year。
i was not a student last year。（否定句）
were you a student last year？（一般疑問句）
yes i was 。no i was not。
there was a desk in the front of the classroom。
there was not a desk in the front of the classroom。
was there a desk in the front of the classroom？
yes there was 。no there was not。
there were three banks on the green street. three days ago。
there were not three banks on the green street three days ago。
were there three banks on the green street three days ago？
yes ，there were 。
no，there were not。
2樓：雙贏兼贏
i was a student last year
i wasnt a student last year was you a student last year yes i was no i wasnt
there was a desk in the front of the classroom yesterday
was there a dest in the front of the classroom yesterday
yes there was no there wasnt
there wasnt a desk in the front of the classroom yesterday
there were two banks on green street three days ago
were there two banks on green street three days ago
yes there were no there werent
there werent two banks on green street three days ago
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