(3) He ,she , it 等代词单个做主语: He is in the tree. She likes her family very much. (4) 单个的人名,地名或称呼作主语: Mary is a doctor. Uncle Li speaks a little English. Changchun is a beautiful city.
(5) 指示代词this, that 等作主语: This is a pear. That is an apple .
(6) Everyone, everything ,something, nobody, nothing.等不定代词作主语时 Is everyone here today? Everything is ok .