今日课题：有这么个意思：她积极帮助其他同学。就有人这么说：She is active to help other students.
课题讲解：今天我们就一起来探讨一下这个句子说得对还是不对。请先跟我来熟悉一个一次词语的意思和用法，它是：active。Active是形容词，意思是“(in the habit of) doing things; energetic”，是指“（惯于）做事的； 精力旺盛的；积极的；活跃的”。例如：
She lead an active life 她过着活跃的生活。
Although he's quite old he's still very active. 他虽然老了, 可仍闲不住。
如果要用active来表示积极，有精力做某事，后面不跟动词不定式，而是有个固定的搭配模式：be active in something(doing something)。例如：
If you had been active in scientific pursuits, you would have been much better informed.如果你过去积极参加科研活动的话，你本来会有更丰富的知识。
He was active in organizing student meetings.他积极组织学生集会。
现在我们回过头来看今天的课题句子：She is active to help other students.这里使用了动词不定式。因此，根据所要表达的语意，正确的说法是：She is active in helping other students.
我们今天的学习就到此结束了，下期再见。
She takes an active part in local politics. 她积极参加本地的政治活动。