to be 与being 的区别His mum got lost in the big store,never (to be heard of\being heard of) again.为什么选前一个?
问题描述：
to be 与being 的区别
His mum got lost in the big store,never (to be heard of\being heard of) again.
为什么选前一个?
答
此处非谓语动词作状语,二者皆可作状语但不定式一般作目的或结果状语[to do 前一般有only,表意想不到结果eg.I arrived at the station only to find the train gone]或在be +情感形容词后作原因状语eg.I am sorry to ...