Present progressive

• English
• Secondary Education

Present progressive

Applying this simple formula : 
S + to be + V-ing + O/A

S + to be + not + V-ing + O/A

How many formulas are there in previous?

1. 1
2. 3
3. 2
4. 4

what is 1+1

1. 1
2. 3
3. 2
4. 4