English verb conjugation COULD FIRM

Regular verb: firm - firmed - firmed

Affirmation

Simple form

I could firm
you could firm
he could firm
we could firm
you could firm
they could firm

V-ing form

I could be firming
you could be firming
he could be firming
we could be firming
you could be firming
they could be firming

Perfect

I could have firmed
you could have firmed
he could have firmed
we could have firmed
you could have firmed
they could have firmed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I firm?
could you firm?
could he firm?
could we firm?
could you firm?
could they firm?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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