Continues Present Tense

Active Formulas:

S + (is/am/are) + Ving + O
Eg: I am writing a letter.
Eg: He is plucking the flower.
Eg: They are playing cricket
Eg: We are studying English.

Negative:
S + (is/am/are) + not + Ving + O
Eg: I am not writing a letter.
Eg: He is not plucking the flower.
Eg: They are not playing cricket
Eg: We are not studying english.

Question:
(is/am/are) + S + Ving + O
Eg: Am i writing a letter?
Eg: Is he plucking the flower?
Eg: Are they playing cricket?
Eg: Are we studying english?
With Wh Question: Why am i writing a letter?

Question Negative:
(is/am/are) + S + not + Ving + O
Eg: Am i not writing a letter?