Indicative
Present Indefinite
I strengthen
you strengthen
he/she/it strengthens
we strengthen
you strengthen
they strengthen
Present Continuous
I am strengthening
you are strengthening
he/she/it is strengthening
we are strengthening
you are strengthening
they are strengthening
Present Perfect
I have strengthened
you have strengthened
he/she/it has strengthened
we have strengthened
you have strengthened
they have strengthened
Present Perfect Continuous
I have been strengthening
you have been strengthening
he/she/it has been strengthening
we have been strengthening
you have been strengthening
they have been strengthening
Past Indefinite
I strengthened
you strengthened
he/she/it strengthened
we strengthened
you strengthened
they strengthened
Past Continuous
I was strengthening
you were strengthening
he/she/it was strengthening
we were strengthening
you were strengthening
they were strengthening
Past Perfect
I had strengthened
you had strengthened
he/she/it had strengthened
we had strengthened
you had strengthened
they had strengthened
Past Perfect Continuous
I had been strengthening
you had been strengthening
he/she/it had been strengthening
we had been strengthening
you had been strengthening
they had been strengthening
Future Indefinite
I will strengthen
you will strengthen
he/she/it will strengthen
we will strengthen
you will strengthen
they will strengthen
Future Continuous
I will be strengthening
you will be strengthening
he/she/it will be strengthening
we will be strengthening
you will be strengthening
they will be strengthening
Future Perfect
I will have strengthened
you will have strengthened
he/she/it will have strengthened
we will have strengthened
you will have strengthened
they will have strengthened
Future Perfect Continuous
I will have been strengthening
you will have been strengthening
he/she/it will have been strengthening
we will have been strengthening
you will have been strengthening
they will have been strengthening
Conditional
Conditional Present
I would strengthen
you would strengthen
he/she/it would strengthen
we would strengthen
you would strengthen
they would strengthen
Conditional Present Continuous
I would be strengthening
you would be strengthening
he/she/it would be strengthening
we would be strengthening
you would be strengthening
they would be strengthening
Conditional Perfect
I would have strengthened
you would have strengthened
he/she/it would have strengthened
we would have strengthened
you would have strengthened
they would have strengthened
Conditional Perfect Continuous
I would have been strengthening
you would have been strengthening
he/she/it would have been strengthening
we would have been strengthening
you would have been strengthening
they would have been strengthening