He wants to travel around the world and keep the earth clean.后面为什么不是 to keep

Question

He usually takes photos and looks after plants.后面looks为什么是三单？

Answer 1

首先，主语是he
第三人称单数。所以谓语动词是wants.
其次，sb
want
to
do
someting
.是固定句式。
再次，and
作为并列连词连结两个动词
travel
和keep.
另外，He
ususlly
takes
photos
and
looks
after
plants。
也是同样的道理，He
是第三人称单数，谓语动词用单数。and
是并列连词连结两个谓语，谓语应该保持一致。所以是looks
。
这种类型的题，只要找到并列连词，然后再看主语，最后看谓语就可以了。
希望对你有用

Answer 2

He
wants
to
travel
around
the
world
and
keep
the
earth
clean。中不用to
是为了避免重复，啰嗦。是and连接的to的并列宾语。
而He
usually
takes
photos
and
looks
after
plants。用looks是因为表示是and连接的并列成分。