关于什么时候用动词原形Lucy starts __(do)her homework at six o’clock【前面是
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Lucy starts to do her homework at six o'clock.

start to do sth

The first lesson starts at7:15.

一般现在时,第三人称单数(the first lesson),后面动词变形.

He often uses the Internet to do their work.

use to do

not good at doing sth

Swimming is her favourite sport.

swimming这里做主语,是名词游泳,而非动词游泳.

一般现在时,主语是第三人称单数(he/she/it),动词要相应变形.

现在进行时、介词后面、部分动词后,它们后面所接的动词用ing形式.

一般现在时,主语是第一人称单复数、第二人称单复数、第三人称复数,一般用动词原形.

部分动词后再接动词,要用动词原形.