be后面为什么要加动词的ing形式?
1、时态是进行时的时候。因为进行时的结构是be+doing
They are playing basketball now.
现在,他们正在打篮球。
2、是主系表结构的时候,其中系动词是be动词。结构是主语+be动词+表语。
He is interested in music.
他对音乐感兴趣。
3、句子中没有谓语,需要加be动词来作谓语。
Clearly there is a problem here
显然,这里出了个问题。
4、在被动语态中。因为被动语态的结构是be+done
This must be kept inmind.
我们必须把这个记在心里。
扩展资料:
“Be”除了原形的“be”之外,还有另外七种形式:am, is, are, been, being, was, were.
要看语句的时态:
如果是一般过去时,就用was/were
如果是一般现在时,就用am/is/are
如果是一般将来时,就用will be
然后看主语的人称及复数形式:
一般过去时:
第一人称单数和第三人称的单数形式,则用was
第一人称复数和第二人称复数、第三人称的复数,则用were
第二人称单数也用were
一般现在时:
第一人称单数形式,用am
第三人称单数形式,用is
第一人称复数、第二人称复数、第三人称的复数形式,则用are
第二人称单数也用are
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