新托福之非谓语动词不定式省略用法

动词不定式的省略用法 1. ┏help to do = help do 可省可不省 ┗help sb to do = help sb do 2. 使役动词必省to let sb do ; make sb do; have sb do ; bid sb do have sth done 3. 关于感观动词 see, hear, notice, feel, watc