bagaimana rumus present cotinous tense?

subject-tobe-verb.ing

Rumusnya:
S + to be + V. ing + O/C

Subjek We,you,they to be nya are
Subjek I to be nya am
Subjel She, He, It to be nya is

Ex:
I am reading a book now.
They are playing badminton right now.
She is cooking fried rice in the kitchen.