I grumble you grumble she grumbles we grumble you grumble they grumble
Present continuous
I am grumbling you are grumbling she is grumbling we are grumbling you are grumbling they are grumbling
Preterite
I grumbled you grumbled she grumbled we grumbled you grumbled they grumbled
Preterite continuous
I was grumbling you were grumbling she was grumbling we were grumbling you were grumbling they were grumbling
Present perfect
I have grumbled you have grumbled she has grumbled we have grumbled you have grumbled they have grumbled
Present perfect continuous
I have been grumbling you have been grumbling she has been grumbling we have been grumbling you have been grumbling they have been grumbling
Pluperfect
I had grumbled you had grumbled she had grumbled we had grumbled you had grumbled they had grumbled
Pluperfect continuous
I had been grumbling you had been grumbling she had been grumbling we had been grumbling you had been grumbling they had been grumbling
Future
I will grumble you will grumble she will grumble we will grumble you will grumble they will grumble
Future continuous
I will be grumbling you will be grumbling she will be grumbling we will be grumbling you will be grumbling they will be grumbling
Future perfect
I will have grumbled you will have grumbled she will have grumbled we will have grumbled you will have grumbled they will have grumbled
Future perfect continuous
I will have been grumbling you will have been grumbling she will have been grumbling we will have been grumbling you will have been grumbling they will have been grumbling
Conditional
Present
I would grumble you would grumble she would grumble we would grumble you would grumble they would grumble
Present continuous
I would be grumbling you would be grumbling she would be grumbling we would be grumbling you would be grumbling they would be grumbling
Past
I would have grumbled you would have grumbled she would have grumbled we would have grumbled you would have grumbled they would have grumbled
Past continuous
I would have been grumbling you would have been grumbling she would have been grumbling we would have been grumbling you would have been grumbling they would have been grumbling