Indicative
Present Indefinite
I contribute paper
you contribute paper
he/she/it contributes paper
we contribute paper
you contribute paper
they contribute paper
Present Continuous
I am contributing paper
you are contributing paper
he/she/it is contributing paper
we are contributing paper
you are contributing paper
they are contributing paper
Present Perfect
I have contributed paper
you have contributed paper
he/she/it has contributed paper
we have contributed paper
you have contributed paper
they have contributed paper
Present Perfect Continuous
I have been contributing paper
you have been contributing paper
he/she/it has been contributing paper
we have been contributing paper
you have been contributing paper
they have been contributing paper
Past Indefinite
I contributed paper
you contributed paper
he/she/it contributed paper
we contributed paper
you contributed paper
they contributed paper
Past Continuous
I was contributing paper
you were contributing paper
he/she/it was contributing paper
we were contributing paper
you were contributing paper
they were contributing paper
Past Perfect
I had contributed paper
you had contributed paper
he/she/it had contributed paper
we had contributed paper
you had contributed paper
they had contributed paper
Past Perfect Continuous
I had been contributing paper
you had been contributing paper
he/she/it had been contributing paper
we had been contributing paper
you had been contributing paper
they had been contributing paper
Future Indefinite
I will contribute paper
you will contribute paper
he/she/it will contribute paper
we will contribute paper
you will contribute paper
they will contribute paper
Future Continuous
I will be contributing paper
you will be contributing paper
he/she/it will be contributing paper
we will be contributing paper
you will be contributing paper
they will be contributing paper
Future Perfect
I will have contributed paper
you will have contributed paper
he/she/it will have contributed paper
we will have contributed paper
you will have contributed paper
they will have contributed paper
Future Perfect Continuous
I will have been contributing paper
you will have been contributing paper
he/she/it will have been contributing paper
we will have been contributing paper
you will have been contributing paper
they will have been contributing paper
Conditional
Conditional Present
I would contribute paper
you would contribute paper
he/she/it would contribute paper
we would contribute paper
you would contribute paper
they would contribute paper
Conditional Present Continuous
I would be contributing paper
you would be contributing paper
he/she/it would be contributing paper
we would be contributing paper
you would be contributing paper
they would be contributing paper
Conditional Perfect
I would have contributed paper
you would have contributed paper
he/she/it would have contributed paper
we would have contributed paper
you would have contributed paper
they would have contributed paper
Conditional Perfect Continuous
I would have been contributing paper
you would have been contributing paper
he/she/it would have been contributing paper
we would have been contributing paper
you would have been contributing paper
they would have been contributing paper