English verb conjugation COULD STIFLE

Regular verb: stifle - stifled - stifled

Affirmation

Simple form

I could stifle
you could stifle
he could stifle
we could stifle
you could stifle
they could stifle

V-ing form

I could be stifling
you could be stifling
he could be stifling
we could be stifling
you could be stifling
they could be stifling

Perfect

I could have stifled
you could have stifled
he could have stifled
we could have stifled
you could have stifled
they could have stifled

V-ing perfect

I could have been stifling
you could have been stifling
he could have been stifling
we could have been stifling
you could have been stifling
they could have been stifling

Negation

Simple form

I couldn't stifle
you couldn't stifle
he couldn't stifle
we couldn't stifle
you couldn't stifle
they couldn't stifle

V-ing form

I couldn't be stifling
you couldn't be stifling
he couldn't be stifling
we couldn't be stifling
you couldn't be stifling
they couldn't be stifling

Perfect

I couldn't have stifled
you couldn't have stifled
he couldn't have stifled
we couldn't have stifled
you couldn't have stifled
they couldn't have stifled

V-ing perfect

I couldn't have been stifling
you couldn't have been stifling
he couldn't have been stifling
we couldn't have been stifling
you couldn't have been stifling
they couldn't have been stifling

Interrogative form

Simple form

could I stifle?
could you stifle?
could he stifle?
could we stifle?
could you stifle?
could they stifle?

V-ing form

could I be stifling?
could you be stifling?
could he be stifling?
could we be stifling?
could you be stifling?
could they be stifling?

Perfect

could I have stifled?
could you have stifled?
could he have stifled?
could we have stifled?
could you have stifled?
could they have stifled?

V-ing perfect

could I have been stifling?
could you have been stifling?
could he have been stifling?
could we have been stifling?
could you have been stifling?
could they have been stifling?

Interro-negative form

Simple form

couldn't I stifle?
couldn't you stifle?
couldn't he stifle?
couldn't we stifle?
couldn't you stifle?
couldn't they stifle?

V-ing form

couldn't I be stifling?
couldn't you be stifling?
couldn't he be stifling?
couldn't we be stifling?
couldn't you be stifling?
couldn't they be stifling?

Perfect

couldn't I have stifled?
couldn't you have stifled?
couldn't he have stifled?
couldn't we have stifled?
couldn't you have stifled?
couldn't they have stifled?

V-ing perfect

couldn't I have been stifling?
couldn't you have been stifling?
couldn't he have been stifling?
couldn't we have been stifling?
couldn't you have been stifling?
couldn't they have been stifling?

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