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.)
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