She is studying math.
He is writing a message.
I am doing my homework.
They are playing soccer.
We are singing together.
I am solving my english homework.
1- Susan always smiles. 
2- George seldom laughs. 
3- We rarely frown. 
4- He is handsome. 
5- She is beautiful.
6- I study English.
7- He plays tennis.
8- I work in a bank
9- I leave Madrid tomorrow morning
10- I don't play tennis.
11- She doesn´t go to the cinema. 
12- We don´t know the answer.
13- Do you play football?
14- Does she go to the cinema? 
15- Do we know the answer?
16- I like hamburgers.
17- Does he play the guitar?
18- Do you like hamburgers?
19- She is not at home.
20- He is not very tall.