用不定式表目的是最简单，也是最常用的方法，它既可以用于句末，也可用于句首，但比较而言，用于句首时，其强调意味较浓。

表目的，也是的，变体。为了不至于睡着，他们坐在地板上，轮流着讲故事。为了不使背部受伤，你在扛重东西时，一定要将膝盖弯曲着。

表目的用todo形式 这是英语当中的知识点

1,to do表目的 比如He went shopping to buy some food.2,so that表目的 He went shopping so that he could by some food.3,so as to表目的 He went shopping so as to buy some food.4,with the intention/purpose of (doing) sth.表目的.比如He went shopping with the intention/purpose of buying some food.希望对你有所帮助