问题标题:
Hewantstotravelaroundtheworldandkeeptheearthclean.后面为什么不是tokeepHeusuallytakesphotosandlooksafterplants.后面looks为什么是三单?
问题描述:

Hewantstotravelaroundtheworldandkeeptheearthclean.后面为什么不是tokeep

Heusuallytakesphotosandlooksafterplants.后面looks为什么是三单?

李桂华回答:
  1.Hewantstodotwothings:travelaroundtheworldandkeeptheearthclean.相当于:Hewantstotravelaroundtheworldand(to)keeptheearthclean.keep与travel平行,跟在wants后面,第二个to省略2....
崔喜红回答:
  那加to错吗
李桂华回答:
  不错,但一般不加
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