Indicative
Present Indefinite
I come upon
you come upon
he/she/it comes upon
we come upon
you come upon
they come upon
Present Continuous
I am coming upon
you are coming upon
he/she/it is coming upon
we are coming upon
you are coming upon
they are coming upon
Present Perfect
I have come upon
you have come upon
he/she/it has come upon
we have come upon
you have come upon
they have come upon
Present Perfect Continuous
I have been coming upon
you have been coming upon
he/she/it has been coming upon
we have been coming upon
you have been coming upon
they have been coming upon
Past Indefinite
I came upon
you came upon
he/she/it came upon
we came upon
you came upon
they came upon
Past Continuous
I was coming upon
you were coming upon
he/she/it was coming upon
we were coming upon
you were coming upon
they were coming upon
Past Perfect
I had come upon
you had come upon
he/she/it had come upon
we had come upon
you had come upon
they had come upon
Past Perfect Continuous
I had been coming upon
you had been coming upon
he/she/it had been coming upon
we had been coming upon
you had been coming upon
they had been coming upon
Future Indefinite
I will come upon
you will come upon
he/she/it will come upon
we will come upon
you will come upon
they will come upon
Future Continuous
I will be coming upon
you will be coming upon
he/she/it will be coming upon
we will be coming upon
you will be coming upon
they will be coming upon
Future Perfect
I will have come upon
you will have come upon
he/she/it will have come upon
we will have come upon
you will have come upon
they will have come upon
Future Perfect Continuous
I will have been coming upon
you will have been coming upon
he/she/it will have been coming upon
we will have been coming upon
you will have been coming upon
they will have been coming upon
Conditional
Conditional Present
I would come upon
you would come upon
he/she/it would come upon
we would come upon
you would come upon
they would come upon
Conditional Present Continuous
I would be coming upon
you would be coming upon
he/she/it would be coming upon
we would be coming upon
you would be coming upon
they would be coming upon
Conditional Perfect
I would have come upon
you would have come upon
he/she/it would have come upon
we would have come upon
you would have come upon
they would have come upon
Conditional Perfect Continuous
I would have been coming upon
you would have been coming upon
he/she/it would have been coming upon
we would have been coming upon
you would have been coming upon
they would have been coming upon