English verb conjugation COULD OCCUR

Regular verb: occur - occurred - occurred

Affirmation

Simple form

I could occur
you could occur
he could occur
we could occur
you could occur
they could occur

V-ing form

I could be occurring
you could be occurring
he could be occurring
we could be occurring
you could be occurring
they could be occurring

Perfect

I could have occurred
you could have occurred
he could have occurred
we could have occurred
you could have occurred
they could have occurred

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I occur?
could you occur?
could he occur?
could we occur?
could you occur?
could they occur?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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