使役动词:have let make
have sb do have sth done let sb do make sb do
情态动词:need should shall will would can could may might dare
情态动词后加原形 dare和need很特别,可作动词或情态动词,用法一样.
特例:sth need doing sth need to be done
be动词:am is are 及他们的过去式
使役动词:have let make
have sb do have sth done let sb do make sb do
情态动词:need should shall will would can could may might dare
情态动词后加原形 dare和need很特别,可作动词或情态动词,用法一样.
特例:sth need doing sth need to be done
be动词:am is are 及他们的过去式