Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could truffle you could truffle he could truffle we could truffle you could truffle they could truffle
V-ing form
I could be truffling you could be truffling he could be truffling we could be truffling you could be truffling they could be truffling
Perfect
I could have truffled you could have truffled he could have truffled we could have truffled you could have truffled they could have truffled
V-ing perfect
I could have been truffling you could have been truffling he could have been truffling we could have been truffling you could have been truffling they could have been truffling
Negation
Simple form
I could not truffle you could not truffle he could not truffle we could not truffle you could not truffle they could not truffle
V-ing form
I could not be truffling you could not be truffling he could not be truffling we could not be truffling you could not be truffling they could not be truffling
Perfect
I could not have truffled you could not have truffled he could not have truffled we could not have truffled you could not have truffled they could not have truffled
V-ing perfect
I could not have been truffling you could not have been truffling he could not have been truffling we could not have been truffling you could not have been truffling they could not have been truffling
Interrogative form
Simple form
could I truffle? could you truffle? could he truffle? could we truffle? could you truffle? could they truffle?
V-ing form
could I be truffling? could you be truffling? could he be truffling? could we be truffling? could you be truffling? could they be truffling?
Perfect
could I have truffled? could you have truffled? could he have truffled? could we have truffled? could you have truffled? could they have truffled?
V-ing perfect
could I have been truffling? could you have been truffling? could he have been truffling? could we have been truffling? could you have been truffling? could they have been truffling?
Interro-negative form
Simple form
could I not truffle? could you not truffle? could he not truffle? could we not truffle? could you not truffle? could they not truffle?
V-ing form
could I not be truffling? could you not be truffling? could he not be truffling? could we not be truffling? could you not be truffling? could they not be truffling?
Perfect
could I not have truffled? could you not have truffled? could he not have truffled? could we not have truffled? could you not have truffled? could they not have truffled?
V-ing perfect
could I not have been truffling? could you not have been truffling? could he not have been truffling? could we not have been truffling? could you not have been truffling? could they not have been truffling?