什么情况下to后加ing，或加动词原形

to 是介词时，后面加ing形式的动词。如：look forward to doing sth
to是动词不定式的小品词时，后面加动词原形。如：want to do sth.追问

还有没有像lookforwordto一类的短语？

追答

adapt to,
add to     
add up to      
adjust to,
apply oneself to
be addicted to,
be devoted to,
belong to,
due to,
feel up to    
get accustomed to
in addition to
look up to
make contributions to,
object to,
pay attention to,
reply to
stick to,
turn to

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