一、主语——习惯于发号施令，偶尔也会被赶下台
在句子中，主语是执行句子的行为或动作的主体。主语一般位于句子开头，且不能省略。但在某些特定的句式里，如：疑问句、倒装句、祈使句、感叹句等，句子主语也可以“下台”而位于谓语动词之后或省略。能够充当主语的主要有名词(短语)、代词、数词、动名词(短语)、动词不定式(短语)和从句等。
(2020·全国卷Ⅱ书面表达)The farm is located at the foot of the hill near our school.(名词作主语)
(2019·全国卷Ⅰ书面表达)To let China go to the world and let the world understand China is my first aim. (不定式短语作主语)
(2020·全国卷Ⅰ书面表达)What touches me most is her full devotion to work. (what引导的主语从句作主语)
(2020·北京高考书面表达)It was shown that only ten percent students were able to be devoted to their study. (代词it充当形式主语，that引导的主语从句作真正的主语)
[名师指津] 当从句作主语时，为避免头重脚轻，可用it作形式主语，而把真正的主语(主语从句)后置。
