Yourbikeneeds_____.You‘dbetterdoirightnow.
B
need+to be done或 need+doing 都表示被动的动作。 类似的动词还有 want，require 等。他们都是后面跟动名词的主动式或不定式的被动式。
He‘s working hard_____.
_____alltherepresentativesstillnotthere，themeetingwaspostponedforseveralhours.
It was not until she had finished all her work_____.