I can triffle you can triffle he can triffle we can triffle you can triffle they can triffle
V-ing form
I can be triffling you can be triffling he can be triffling we can be triffling you can be triffling they can be triffling
Perfect
I can have triffled you can have triffled he can have triffled we can have triffled you can have triffled they can have triffled
V-ing perfect
I can have been triffling you can have been triffling he can have been triffling we can have been triffling you can have been triffling they can have been triffling
Negation
Simple form
I cannot triffle you cannot triffle he cannot triffle we cannot triffle you cannot triffle they cannot triffle
V-ing form
I cannot be triffling you cannot be triffling he cannot be triffling we cannot be triffling you cannot be triffling they cannot be triffling
Perfect
I cannot have triffled you cannot have triffled he cannot have triffled we cannot have triffled you cannot have triffled they cannot have triffled
V-ing perfect
I cannot have been triffling you cannot have been triffling he cannot have been triffling we cannot have been triffling you cannot have been triffling they cannot have been triffling
Interrogative form
Simple form
can I triffle? can you triffle? can he triffle? can we triffle? can you triffle? can they triffle?
V-ing form
can I be triffling? can you be triffling? can he be triffling? can we be triffling? can you be triffling? can they be triffling?
Perfect
can I have triffled? can you have triffled? can he have triffled? can we have triffled? can you have triffled? can they have triffled?
V-ing perfect
can I have been triffling? can you have been triffling? can he have been triffling? can we have been triffling? can you have been triffling? can they have been triffling?
Interro-negative form
Simple form
can I not triffle? can you not triffle? can he not triffle? can we not triffle? can you not triffle? can they not triffle?
V-ing form
can I not be triffling? can you not be triffling? can he not be triffling? can we not be triffling? can you not be triffling? can they not be triffling?
Perfect
can I not have triffled? can you not have triffled? can he not have triffled? can we not have triffled? can you not have triffled? can they not have triffled?
V-ing perfect
can I not have been triffling? can you not have been triffling? can he not have been triffling? can we not have been triffling? can you not have been triffling? can they not have been triffling?