该内容是考试会涉及到的知识点，北京张博士医考中心搜集整理，请参考。

　　例句：

　　In it,a mother is asked to interact with her child in a normal way before putting on a blank expression and not giving them any visual social feedback:The child becomes increasingly distressed as she tries to capture her mother’s attention.

　　首先，我们还是需要断句。在这里我们把它断成三部分①In it,a mother is asked to interact with her child in a normal way②before putting on a blank expression and not giving them any visual social feedback:③The child becomes increasingly distressed as she tries to capture her mother’s attention。这个句子断句还是比较简单的。

　　然后我们可以开始抓主干，识修饰了，要想快速的抓到主干，我们先把从句识别出来。

　　首先第一个从句：before putting on a blank expression and not giving them any visual social feedback。这里是一个时间状语从句。

　　第二个从句：as she tries to capture her mother’s attention。这同样是一个时间状语从句。抓出从句之后，我们就找到了句子的主干：In it,a mother is asked to interact with her child in a normal way，在这个句子中出现了一个冒号，冒号后边是一个同位语成分，就是起到解释说明的作用。

　　整个句子翻译：

　　在实验中，母亲被要求先以正常方式与孩子交流，之后摆出一副面无表情的神情并且不给孩子任何视觉上的社交反馈;孩子在试图吸引母亲注意力的过程中变得越来越苦恼。

　　「张博士医考www.guojiayikao.com整理，如有转载，请注明出处」