English verb conjugation
COULD THWART

Regular verb: thwart - thwarted - thwarted

Affirmation

Simple form	V-ing form
I could thwart you could thwart he could thwart we could thwart you could thwart they could thwart	I could be thwarting you could be thwarting he could be thwarting we could be thwarting you could be thwarting they could be thwarting
Perfect	V-ing perfect
I could have thwarted you could have thwarted he could have thwarted we could have thwarted you could have thwarted they could have thwarted	I could have been thwarting you could have been thwarting he could have been thwarting we could have been thwarting you could have been thwarting they could have been thwarting

Negation

Simple form	V-ing form
I couldn't thwart you couldn't thwart he couldn't thwart we couldn't thwart you couldn't thwart they couldn't thwart	I couldn't be thwarting you couldn't be thwarting he couldn't be thwarting we couldn't be thwarting you couldn't be thwarting they couldn't be thwarting
Perfect	V-ing perfect
I couldn't have thwarted you couldn't have thwarted he couldn't have thwarted we couldn't have thwarted you couldn't have thwarted they couldn't have thwarted	I couldn't have been thwarting you couldn't have been thwarting he couldn't have been thwarting we couldn't have been thwarting you couldn't have been thwarting they couldn't have been thwarting

Interrogative form

Simple form	V-ing form
could I thwart? could you thwart? could he thwart? could we thwart? could you thwart? could they thwart?	could I be thwarting? could you be thwarting? could he be thwarting? could we be thwarting? could you be thwarting? could they be thwarting?
Perfect	V-ing perfect
could I have thwarted? could you have thwarted? could he have thwarted? could we have thwarted? could you have thwarted? could they have thwarted?	could I have been thwarting? could you have been thwarting? could he have been thwarting? could we have been thwarting? could you have been thwarting? could they have been thwarting?

Interro-negative form

Simple form	V-ing form
couldn't I thwart? couldn't you thwart? couldn't he thwart? couldn't we thwart? couldn't you thwart? couldn't they thwart?	couldn't I be thwarting? couldn't you be thwarting? couldn't he be thwarting? couldn't we be thwarting? couldn't you be thwarting? couldn't they be thwarting?
Perfect	V-ing perfect
couldn't I have thwarted? couldn't you have thwarted? couldn't he have thwarted? couldn't we have thwarted? couldn't you have thwarted? couldn't they have thwarted?	couldn't I have been thwarting? couldn't you have been thwarting? couldn't he have been thwarting? couldn't we have been thwarting? couldn't you have been thwarting? couldn't they have been thwarting?