三单的用法
以他（he）、她（she）、它（it）作主语时，谓语动词要变成三单的形式，即在动词后面加-（e）s。单个人名、地名或称呼作主语，是第三人称单数。单数可数名词或“this/that/the+单数可数名词”作主语时，是第三人称单数。
第三人称单数的构成方法
与名词的单数变复数规则大致一样，即：
(1)一般情况下由动词后加-s构成：work / works，read / reads等。
(2)以s, x, z, sh, ch以及字母o结构的动词，后加-es：guess / guesses, mix / mixes, go / goes, buzz / buzzes, finish / finishes, catch / catches等。
(3)以辅音字母加y结尾的动词，应将y改为i再加-es：fly / flies, study / studies等。
【注】①有个别的变化不规则，如have / has, be / is等。
②词尾-s和-es读音规则是：在s, x, z, sh, ch后的es读作[iz]，其余的读作[z]。
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