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结构 be(is+am+are)+动词ing形式

动词-动词ing形式变化规则

1:一般情况下,直接加ing  cook-cooking                    eat-eating

2: 以不发音e结尾的,去e再加ing make -making            taste -tasting

3:重读闭音节结尾的,双写末尾的辅音字母 再+ing

get-getting    forget-forgetting   sit-sitting

skip-skipping    shop-shopping     stop-stopping

begin-beginning     run-running

swim-swimming

句型结构

肯定句 :主语+be动词+动词ing+其他

they are walking in the park

she is reading in the classroom

否定句:主语+be动词+not+动词ing+其他

they are not / aren't working in the park

she is not /isn't reading in the classroom

一般疑问句:Be动词+主语+动词ing+其他

Are they working in the park?

is she reading in the classroom?

特殊疑问句:特殊疑问句+be动词+动词ing+其他

what are they doing in the park?

who is reading in the classroom

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