只是在一般现在时的非复合谓语（即行为动词单独使用时）情况下,谓语动词词尾加 s/es.例：
He works hard to support his family.
A lawyer practices law.
An American speaks English.
在英语里,是所有的第三人称单数形式的句子,都要在动词后加s或es吗?
只是在一般现在时的非复合谓语（即行为动词单独使用时）情况下,谓语动词词尾加 s/es.例：
He works hard to support his family.
A lawyer practices law.
An American speaks English.