I applaud the performance. 我为演出鼓掌喝彩。 (1) 改为以 She 为主语的现在进行时 —> She is applauding the performance. 她为演出鼓掌喝彩。 (2) 改为以 they 为主语的过去时疑问句 —> Did they applaud the performance? 他们为演出鼓掌喝彩了吗？ (3) 改为以 You 为主语，并且以 Why 开头的过去时疑问句 —> Why did you applaud the performance? 你为什么为演出鼓掌喝彩？ I eat noodles at the noodle restaurant. 我在面馆吃面。 (1) 改为以 We 为主语的将来时 —> We will eat noodles at the noodle restaurant. 我们要在面馆吃面。 (2) 改为以 Let's 为主语 —> Let's eat noodles at the noodle restaurant. 我们在面馆吃面吧。 (3) 改为以 You 为主语的过去时疑问句 —> Did you eat noodles at the restaurant? 你在饭馆吃面了吗？ —> Did you eat noodles at the noodle restaurant? 你在面馆吃面了吗？