English verb conjugation
COULD THWACK

Regular verb: thwack - thwacked - thwacked

Affirmation

Simple form	V-ing form
I could thwack you could thwack she could thwack we could thwack you could thwack they could thwack	I could be thwacking you could be thwacking she could be thwacking we could be thwacking you could be thwacking they could be thwacking
Perfect	V-ing perfect
I could have thwacked you could have thwacked she could have thwacked we could have thwacked you could have thwacked they could have thwacked	I could have been thwacking you could have been thwacking she could have been thwacking we could have been thwacking you could have been thwacking they could have been thwacking

Negation

Simple form	V-ing form
I couldn't thwack you couldn't thwack she couldn't thwack we couldn't thwack you couldn't thwack they couldn't thwack	I couldn't be thwacking you couldn't be thwacking she couldn't be thwacking we couldn't be thwacking you couldn't be thwacking they couldn't be thwacking
Perfect	V-ing perfect
I couldn't have thwacked you couldn't have thwacked she couldn't have thwacked we couldn't have thwacked you couldn't have thwacked they couldn't have thwacked	I couldn't have been thwacking you couldn't have been thwacking she couldn't have been thwacking we couldn't have been thwacking you couldn't have been thwacking they couldn't have been thwacking

Interrogative form

Simple form	V-ing form
could I thwack? could you thwack? could she thwack? could we thwack? could you thwack? could they thwack?	could I be thwacking? could you be thwacking? could she be thwacking? could we be thwacking? could you be thwacking? could they be thwacking?
Perfect	V-ing perfect
could I have thwacked? could you have thwacked? could she have thwacked? could we have thwacked? could you have thwacked? could they have thwacked?	could I have been thwacking? could you have been thwacking? could she have been thwacking? could we have been thwacking? could you have been thwacking? could they have been thwacking?

Interro-negative form

Simple form	V-ing form
couldn't I thwack? couldn't you thwack? couldn't she thwack? couldn't we thwack? couldn't you thwack? couldn't they thwack?	couldn't I be thwacking? couldn't you be thwacking? couldn't she be thwacking? couldn't we be thwacking? couldn't you be thwacking? couldn't they be thwacking?
Perfect	V-ing perfect
couldn't I have thwacked? couldn't you have thwacked? couldn't she have thwacked? couldn't we have thwacked? couldn't you have thwacked? couldn't they have thwacked?	couldn't I have been thwacking? couldn't you have been thwacking? couldn't she have been thwacking? couldn't we have been thwacking? couldn't you have been thwacking? couldn't they have been thwacking?