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？