12) 英語中的"單數"

1.主語的第三人稱單數形式，即可用"he,she,it"代替的。如：

he,she, it，my friend, his teacher, our classroom, Tom, Mary’s uncle

2.名詞有單數名詞和復數名詞。如：

man(單數)---men(復數) banana(單數)---bananas(復數)

3.動詞有原形，第三人稱單數形式，-ing分詞，過去式，過去分詞。如：

go---goes---going---went---gone

work---works---working---worked---worked

watch---watches---watching---watched---watched

當主語為第三人稱單數的時候，謂語動詞必須用相應的第三人稱單數形式。

如：

The boy wants to be a sales assistant.

Our English teacher is from the US.

Their daughter makes her breakfast all by herself.