I stumble you stumble he stumbles we stumble you stumble they stumble
Present continuous
I am stumbling you are stumbling he is stumbling we are stumbling you are stumbling they are stumbling
Preterite
I stumbled you stumbled he stumbled we stumbled you stumbled they stumbled
Preterite continuous
I was stumbling you were stumbling he was stumbling we were stumbling you were stumbling they were stumbling
Present perfect
I have stumbled you have stumbled he has stumbled we have stumbled you have stumbled they have stumbled
Present perfect continuous
I have been stumbling you have been stumbling he has been stumbling we have been stumbling you have been stumbling they have been stumbling
Pluperfect
I had stumbled you had stumbled he had stumbled we had stumbled you had stumbled they had stumbled
Pluperfect continuous
I had been stumbling you had been stumbling he had been stumbling we had been stumbling you had been stumbling they had been stumbling
Future
I will stumble you will stumble he will stumble we will stumble you will stumble they will stumble
Future continuous
I will be stumbling you will be stumbling he will be stumbling we will be stumbling you will be stumbling they will be stumbling
Future perfect
I will have stumbled you will have stumbled he will have stumbled we will have stumbled you will have stumbled they will have stumbled
Future perfect continuous
I will have been stumbling you will have been stumbling he will have been stumbling we will have been stumbling you will have been stumbling they will have been stumbling
Conditional
Present
I would stumble you would stumble he would stumble we would stumble you would stumble they would stumble
Present continuous
I would be stumbling you would be stumbling he would be stumbling we would be stumbling you would be stumbling they would be stumbling
Past
I would have stumbled you would have stumbled he would have stumbled we would have stumbled you would have stumbled they would have stumbled
Past continuous
I would have been stumbling you would have been stumbling he would have been stumbling we would have been stumbling you would have been stumbling they would have been stumbling