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对于此刻正在发生或这段时间内正在进行的动作，使用现在进行时（am/is/are + 动词-ing）。用 "not" 构成否定句，将 am/is/are 放在主语之前构成疑问句。
She is cook dinner.
She is cooking dinner. — 在 am/is/are 之后的主要动词加上 -ing。
I studying now.
I am studying now. — 在现在进行时中不要省略 "am/is/are"。
are playing
He isn't sleeping.