"There is something wrong with this machine.It needs repairing."

"There is something wrong with this machine.It needs repairing."

题目
"There is something wrong with this machine.It needs repairing."
请问为什么要用”repairing”
答案
needs repairing===needs to be repaired
need和require等词后面加动名词必须用主动表示被动,但加不定式时照旧,该用被动还用被动.比如:these trees require(need) looking after carefully= these trees require(need) to be looked after carefully.
--
常用:need/require +doing sth(=to be done)(此句型主语大多为物)
例:My room is a mess.It needs _____.
A to be tidying up
B.tidying up
C.to tidy up
D.tidied up
(答案为B)
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