English verb conjugation COULD CATALYSE

Regular verb: catalyse - catalysed - catalysed

Affirmation

Simple form

I could catalyse
you could catalyse
he could catalyse
we could catalyse
you could catalyse
they could catalyse

V-ing form

I could be catalysing
you could be catalysing
he could be catalysing
we could be catalysing
you could be catalysing
they could be catalysing

Perfect

I could have catalysed
you could have catalysed
he could have catalysed
we could have catalysed
you could have catalysed
they could have catalysed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I catalyse?
could you catalyse?
could he catalyse?
could we catalyse?
could you catalyse?
could they catalyse?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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