-ing 形式作状语 2. -ing 短语作状语一般表示一个次要的动作 ， 一般都可以变为相应的状语从句或并列 句。 1.-ing 短语在句子中可作状语，来修饰谓语动词 或整个句子，表示动作发生的 时间、原因、条件、结果、让步或伴随等情况。1. 作时间状语 -ing 短语作时间状语要置于句首。如： Hearing the bad news, they couldnt help crying. =When_, they couldnt help crying. 当听到这个不幸的消息时，他们情不自 禁地哭了起来。 they heard the bad newsHaving received his letter, I decided to write back. 收到他的信后，我决定给他回信。 =After_, I decided to write back. I had received his letter 注意：当v-ing 形式所表示的动作发生在谓语动 词动作之前时，应使用完成式：having done _(finish) his homework, he rushed out t
