English verb conjugation COULD CATALYZE

Regular verb: catalyze - catalyzed - catalyzed

Affirmation

Simple form

I could catalyze
you could catalyze
he could catalyze
we could catalyze
you could catalyze
they could catalyze

V-ing form

I could be catalyzing
you could be catalyzing
he could be catalyzing
we could be catalyzing
you could be catalyzing
they could be catalyzing

Perfect

I could have catalyzed
you could have catalyzed
he could have catalyzed
we could have catalyzed
you could have catalyzed
they could have catalyzed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I catalyze?
could you catalyze?
could he catalyze?
could we catalyze?
could you catalyze?
could they catalyze?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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