非谓语动词的用法,非谓语动词就是在句子中不充当谓语的动词。它不受主语的限制,也没有像谓语动词那样的时态和语态的变化,又称为非限定动词,在句子中可以作主语、宾语、表语、宾补、定语和 状语。非谓语动词包括三种形式:不定式、动名词和分词。这里 weather permitting,就是 if weather permits。现在分词作状语的几种情况①分词动作与谓语动作同时发生:She drove away crying.她哭着把车开走了。He came back to his office, hoping to find the material needed for the case.他回到办公室,希望能找到案子所需的材料。Not knowing that the traffic accident happened to her husband, she was waiting for him to have supper.因为不知道她的丈夫发生了交通事故,她还在等他吃晚饭。②分词动作与谓语动作先后发生现在分词的完成式表示分词动作在谓语动作之前发生。Having found out why, he began to repair the machine.由于找到了原因,他开始修理这台机器。Not having finished the homework, he had to stay up late at night .由于没有写完作业,他不得不熬夜。③用现在分词的被动式表示“正在被……”或者“已经被……”This is the second bridge being built across the river.这是正在建的横跨这条河的第二座桥。(作定语)Having been invited, he went to Germany to attend the conference .受到邀请,他去德国出席了这次会议。 (作状语)
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