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am
is
are
+ doing
He is playing basketball.
He is singing.
It is flying.
She is riding a bike.
They are doing morning exercises.
They are dancing.
we / you / they
He is playing basketball.
It is flying.
They are doing morning exercises.
I
he /she/it
are doing
is doing
am doing
I am talking .
You are listening.
We are having a class.
It is singing.
It is dancing.
, it is lying in bed.
--Oh, it is running.
Present participle (现在分词）
4.以一个辅音字母结尾的重读闭音节动词
双写最后一个辅音字母，再加ing.
3.以”ie”结尾的动词,变ie为y,再加ing