grumble - Conjugation

Person	Present	Future	Past
I	grumble	will grumble	grumbled
You	grumble	will grumble	grumbled
He/She/It	grumbles	will grumble	grumbled
We	grumble	will grumble	grumbled
They	grumble	will grumble	grumbled

Person	Present	Future	Past
I	had grumbled	will have grumbled	had grumbled
You	had grumbled	will have grumbled	had grumbled
He/She/It	has grumbled	will have grumbled	had grumbled
We	had grumbled	will have grumbled	had grumbled
They	had grumbled	will have grumbled	had grumbled

Person	Present	Future	Past
I	am grumbling	will be grumbling	was grumbling
You	are grumbling	will be grumbling	were grumbling
He/She/It	is grumbling	will be grumbling	was grumbling
We	are grumbling	will be grumbling	were grumbling
They	are grumbling	will be grumbling	were grumbling

Person	Present	Future	Past
I	have been grumbling	will have been grumbling	had been grumbling
You	have been grumbling	will have been grumbling	had been grumbling
He/She/It	has been grumbling	will have been grumbling	had been grumbling
We	have been grumbling	will have been grumbling	had been grumbling
They	have been grumbling	will have been grumbling	had been grumbling