allow doing sth,allow sb to do sth

1、allow sb to do sth,allow后有人(宾语)时,用不定式,意思是允许某人做某事,如The teacher allowed us to discuss in class yesterday.

2、allow doing sth,allow后没有人(宾语)时,用动词ing形式,意思是允许做某事,如The teacher allowed discussing in class yesterday.没说允许谁做,所以用动词ing形式.

3、一般不用allow to do sth这种形式

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