He wants to travel around the world and keep the earth clean.后面为什么不是 to keepHe usually takes photos and looks after plants.后面looks为什么是三单?

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Hewantstotravelaroundtheworldandkeeptheearthclean.后面为什么不是tokeepHeusuallytakesphotosandlooksafterplan

He wants to travel around the world and keep the earth clean.后面为什么不是 to keepHe usually takes photos and looks after plants.后面looks为什么是三单?
He wants to travel around the world and keep the earth clean.后面为什么不是 to keep
He usually takes photos and looks after plants.后面looks为什么是三单?

He wants to travel around the world and keep the earth clean.后面为什么不是 to keepHe usually takes photos and looks after plants.后面looks为什么是三单?
1.He wants to do two things:travel around the world and keep the earth clean.相当于：
He wants to travel around the world and (to) keep the earth clean.keep 与travel平行,跟在wants 后面,第二个to 省略
2.同样这句中,looks 与takes平行,所以时态需一致,都是三单

want to do 固定结构，travel和 keep 由and 连接，做并列成分
He 主语，后用单三，同样有and连接做并列谓语

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。

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...

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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。
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