English verb conjugation
COULD FLINCH

Regular verb: flinch - flinched - flinched

Affirmation

Simple form	V-ing form
I could flinch you could flinch he could flinch we could flinch you could flinch they could flinch	I could be flinching you could be flinching he could be flinching we could be flinching you could be flinching they could be flinching
Perfect	V-ing perfect
I could have flinched you could have flinched he could have flinched we could have flinched you could have flinched they could have flinched	I could have been flinching you could have been flinching he could have been flinching we could have been flinching you could have been flinching they could have been flinching

Negation

Simple form	V-ing form
I couldn't flinch you couldn't flinch he couldn't flinch we couldn't flinch you couldn't flinch they couldn't flinch	I couldn't be flinching you couldn't be flinching he couldn't be flinching we couldn't be flinching you couldn't be flinching they couldn't be flinching
Perfect	V-ing perfect
I couldn't have flinched you couldn't have flinched he couldn't have flinched we couldn't have flinched you couldn't have flinched they couldn't have flinched	I couldn't have been flinching you couldn't have been flinching he couldn't have been flinching we couldn't have been flinching you couldn't have been flinching they couldn't have been flinching

Interrogative form

Simple form	V-ing form
could I flinch? could you flinch? could he flinch? could we flinch? could you flinch? could they flinch?	could I be flinching? could you be flinching? could he be flinching? could we be flinching? could you be flinching? could they be flinching?
Perfect	V-ing perfect
could I have flinched? could you have flinched? could he have flinched? could we have flinched? could you have flinched? could they have flinched?	could I have been flinching? could you have been flinching? could he have been flinching? could we have been flinching? could you have been flinching? could they have been flinching?

Interro-negative form

Simple form	V-ing form
couldn't I flinch? couldn't you flinch? couldn't he flinch? couldn't we flinch? couldn't you flinch? couldn't they flinch?	couldn't I be flinching? couldn't you be flinching? couldn't he be flinching? couldn't we be flinching? couldn't you be flinching? couldn't they be flinching?
Perfect	V-ing perfect
couldn't I have flinched? couldn't you have flinched? couldn't he have flinched? couldn't we have flinched? couldn't you have flinched? couldn't they have flinched?	couldn't I have been flinching? couldn't you have been flinching? couldn't he have been flinching? couldn't we have been flinching? couldn't you have been flinching? couldn't they have been flinching?