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(1)、结构一(谓语动词为
? 肯定句:主语其它. (注:am,is→was, are→were)
? 否定句:主语+be+not+其它.
一般疑问句:Be+主语+其它?
e.g. I was late yesterday. e.g. They were in Bei jing last year.
I was not late yesterday. They weren’t in Bei jing last year. Were you late yesterday? Were they in Bei jing last year?
Yes, I was. Yes, they were.
No, I wasn't. No, they weren’t
am和is在一般过去时中变为was。(was not=wasn’t)
are在一般过去时中变为were。(were not=weren’t)
(2)
(注意:情态动词 can,may,have to 等等。)
肯定句:主语++动词原形+其它.
? 否定句:主语+情态动词过去式+not+动词原形+其它.
一般疑问句:情态动词过去式+主语+动词原形+其它?
E.g. The old man could swim 30 years ago.
The old man couldn’t swim 30 years ago.
Could the old man swim 30 years ago?
Yes, he could.
No, he couldn’t.
常用情态动词过去式如下:
can—could(能,会)
may―might(可以)
have to―had to(不得不)
shall―should(将要)用于第一人称单数
will―would(将要)用于所有人称
(3)
肯定句:主语++其它.
否定句:主语+ didn’t +动词原形+其它.
一般疑问句:主语+动词原形+其它?