关于什么时候用动词原形Lucy starts __(do)her homework at six o’clock【前面是starts了,后面跟does还是do?】The first lesson___(开始)at7:15.【是start还是starts?】He often uses the Internet ____(做) their work【

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关于什么时候用动词原形Lucy starts __(do)her homework at six o’clock【前面是starts了,后面跟does还是do?】The first lesson___(开始)at7:15.【是start还是starts?】He often uses the Internet ____(做) their work【

关于什么时候用动词原形Lucy starts __(do)her homework at six o’clock【前面是starts了,后面跟does还是do?】The first lesson___(开始)at7:15.【是start还是starts?】He often uses the Internet ____(做) their work【
关于什么时候用动词原形
Lucy starts __(do)her homework at six o’clock【前面是starts了,后面跟does还是do?】
The first lesson___(开始)at7:15.【是start还是starts?】
He often uses the Internet ____(做) their work【用does还是do?前面用uses了,还要不要用does】
not good at 后面跟动词原形吗?
___(游泳)is her favourite sport 【这个要不要加ing?】
什么时候时候用动词原形,什么时候要加ing或者加s?
回答好的可以悬赏加到30或以上,最好今天就能回答.

关于什么时候用动词原形Lucy starts __(do)her homework at six o’clock【前面是starts了,后面跟does还是do?】The first lesson___(开始)at7:15.【是start还是starts?】He often uses the Internet ____(做) their work【
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.