I strengthen you strengthen he strengthens we strengthen you strengthen they strengthen
Present continuous
I am strengthening you are strengthening he is strengthening we are strengthening you are strengthening they are strengthening
Preterite
I strengthened you strengthened he strengthened we strengthened you strengthened they strengthened
Preterite continuous
I was strengthening you were strengthening he was strengthening we were strengthening you were strengthening they were strengthening
Present perfect
I have strengthened you have strengthened he has strengthened we have strengthened you have strengthened they have strengthened
Present perfect continuous
I have been strengthening you have been strengthening he has been strengthening we have been strengthening you have been strengthening they have been strengthening
Pluperfect
I had strengthened you had strengthened he had strengthened we had strengthened you had strengthened they had strengthened
Pluperfect continuous
I had been strengthening you had been strengthening he had been strengthening we had been strengthening you had been strengthening they had been strengthening
Future
I will strengthen you will strengthen he will strengthen we will strengthen you will strengthen they will strengthen
Future continuous
I will be strengthening you will be strengthening he 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 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 will have been strengthening we will have been strengthening you will have been strengthening they will have been strengthening
Conditional
Present
I would strengthen you would strengthen he would strengthen we would strengthen you would strengthen they would strengthen
Present continuous
I would be strengthening you would be strengthening he would be strengthening we would be strengthening you would be strengthening they would be strengthening
Past
I would have strengthened you would have strengthened he would have strengthened we would have strengthened you would have strengthened they would have strengthened
Past continuous
I would have been strengthening you would have been strengthening he would have been strengthening we would have been strengthening you would have been strengthening they would have been strengthening