求need+n 的肯定句和否定句、need+to do 的肯定句和否定句、need doing 的肯定句和否定句

1。need+n。的时候,意思和want接近：e。g。He needs money。It doesn't need explanation。2。need+to do是指需要做某事,主语是动作的发出者：e。g。He needs to clean the house。He doesn't need to clean the house。3。need+doing也是指需要做某事,不过主语是动作的承受着,含有被动意：e。g。The clothes need washing。（这个形式的否定很少见）4。此外need还可用作情态动词,用在含有must do的问句的否定回答中。e。g。-Must I do all the exercises?-No,you needn't。(没必要)