Present
I occur
you occur
he occurs
we occur
you occur
they occur

Perfect
I have occurred
you have occurred
he has occurred
we have occurred
you have occurred
they have occurred

Past
I occurred
you occurred
he occurred
we occurred
you occurred
they occurred

Pluperfect
I had occurred
you had occurred
he had occurred
we had occurred
you had occurred
they had occurred

Future
I will occur
you will occur
he will occur
we will occur
you will occur
they will occur

Future perfect
I will have occurred
you will have occurred
he will have occurred
we will have occurred
you will have occurred
they will have occurred

Present
I occur
you occur
he occur
we occur
you occur
they occur

Present
I have occurred
you have occurred
he have occurred
we have occurred
you have occurred
they have occurred

Imperfect
I occurred
you occurred
he occurred
we occurred
you occurred
they occurred

Pluperfect
I had occurred
you had occurred
he had occurred
we had occurred
you had occurred
they had occurred

Present
I would occur
you would occur
he would occur
we would occur
you would occur
they would occur

Perfect
I would have occurred
you would have occurred
he would have occurred
we would have occurred
you would have occurred
they would have occurred

you occur
we Let's occur
you occur

Present
I am occurring
you are occurring
he is occurring
we are occurring
you are occurring
they are occurring

Perfect
I have been occurring
you have been occurring
he has been occurring
we have been occurring
you have been occurring
they have been occurring

Past
I was occurring
you were occurring
he was occurring
we were occurring
you were occurring
they were occurring

Pluperfect
I had been occurring
you had been occurring
he had been occurring
we had been occurring
you had been occurring
they had been occurring

Future
I will be occurring
you will be occurring
he will be occurring
we will be occurring
you will be occurring
they will be occurring

Future perfect
I will have been occurring
you will have been occurring
he will have been occurring
we will have been occurring
you will have been occurring
they will have been occurring

Present
I would be occurring
you would be occurring
he would be occurring
we would be occurring
you would be occurring
they would be occurring

Perfect
I would have been occurring
you would have been occurring
he would have been occurring
we would have been occurring
you would have been occurring
they would have been occurring