4. seem
【感知】
» ... but they don't seem tired at all.(教材第 46 页)……但是他们好像一点也不累。
» Look at the clouds in the sky. It seems to rain. 看天上的云。好像要下雨了。
» It seems that he can play the piano well. 看起来他钢琴弹得很好。
【探究】

【应用】
单句语法选择
Look at the little boy! He seems out of the room.

A.run
B.running
C.to run

[应用]C

【分析】首先回忆seem的常见用法结构，根据给出的语法知识，seem有三类常用结构：sb/sth seem (to be)+adj.、sb/sth seem to do sth、It seems that...。题目中主语是He，后面接动词原形seem，空格后是动词短语run out of，需结合seem的结构判断空格处的形式。
【解析】根据seem的固定搭配“sb/sth seem to do sth”（某人/某物似乎做某事），此处需用动词不定式作seem的宾语，因此空格处应填to run。A选项为动词原形、B选项为现在分词，均不符合seem的用法要求，故排除A、B，选C。
【答案】C
【知识点】seem的用法；动词不定式
【点评】本题考察seem的核心固定搭配，属于基础语法题，只要牢记seem的常见结构即可正确作答，难度较低。
【难度系数】0.6