第三人称单数怎么用?什么时候用?疑问句怎么用?否定句怎么用?肯定句怎么用?hasn't怎么用?

现在进行时要用现在分词,即-ing形式.e.g.
We are learning English now.
过去式用于一般过去时.过去分词用于现在完成时和被动语态.
Yesterday the 16th Asian Games were held in Guanzhou.
He worked hard last month.
另外,do 和 does用于一般现在时.
I / we; you / you; they 用do.
He / she / it用于第三人称单数.e.g.
① They do homework every day.
Do they do homework every day?Yes,they do.(No,they don't.)
They don't do homework every day.
② He likes English.
He doesn't like English.
Does he like English?Yes,he does.(No,he doesn't.)