PRESENT CONTINUOS TENSE.

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

Aff. structuresubject+ aux. verb+ verb (+ing)+ complement +.

Neg. structuresubject+ aux. verb+ not+ verb (ing)+ complement+.

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

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