必修四 语法-动名词加配套练习 2016-5-10动名词由动词+ing构成，具有动词和名词性质，其否定式在前加not, 在句中起名词的作用，可作主，宾，表，定语。（一）动名词的时态和语态主 动被 动一般式doing being done完成式having done having been doneHe likes being helped. He was afraid of being left alone. The house showed no sign of having been damaged. Im sorry for not having kept my promise.（二）动名词的语法作用：1作主语 Seeing is believing. Choosing what to eat is not as easy as before. It is no use / good arguing with him.It
