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What is Li Yan doing?
What are they doing?
They are having a meeting
They have a meeting.
They are having a meeting.
I tell a story.
I am telling a story.
She sings a song.
She is singing a song.
现在正在进行时，
动词前有be动词，
动词后加ing。
be氏家族三朵花,is, am, 还有are，
I恋am,you恋are
is喜欢he she it
单数用is,复数用are
He an email.
write an email
is
writing
make noise
He noise.
is
making
take a rest
She a rest.
is
taking
He is writing an email.
He is making noise.