Present Continuous Tense.

Action: Now
Aux. Verb: am, is, are
Verb: present participle (+ing)

Aff. structure
subject+ aux. verb+ verb (+ing)+ complement +.

Neg. structure
subject+ aux. verb+ not+ verb (ing)+ complement+.

Interrogative structure
if question
am, is, are+ subject+ verb (ing)+ complement+?

wh question
wh+ am, is, are+subject+ verb(ing)+ complement+?.