English verb conjugation
CAN RIDDLE

Regular verb: riddle - riddled - riddled

Affirmation

Simple form	V-ing form
I can riddle you can riddle he can riddle we can riddle you can riddle they can riddle	I can be riddling you can be riddling he can be riddling we can be riddling you can be riddling they can be riddling
Perfect	V-ing perfect
I can have riddled you can have riddled he can have riddled we can have riddled you can have riddled they can have riddled	I can have been riddling you can have been riddling he can have been riddling we can have been riddling you can have been riddling they can have been riddling

Negation

Simple form	V-ing form
I cannot riddle you cannot riddle he cannot riddle we cannot riddle you cannot riddle they cannot riddle	I cannot be riddling you cannot be riddling he cannot be riddling we cannot be riddling you cannot be riddling they cannot be riddling
Perfect	V-ing perfect
I cannot have riddled you cannot have riddled he cannot have riddled we cannot have riddled you cannot have riddled they cannot have riddled	I cannot have been riddling you cannot have been riddling he cannot have been riddling we cannot have been riddling you cannot have been riddling they cannot have been riddling

Interrogative form

Simple form	V-ing form
can I riddle? can you riddle? can he riddle? can we riddle? can you riddle? can they riddle?	can I be riddling? can you be riddling? can he be riddling? can we be riddling? can you be riddling? can they be riddling?
Perfect	V-ing perfect
can I have riddled? can you have riddled? can he have riddled? can we have riddled? can you have riddled? can they have riddled?	can I have been riddling? can you have been riddling? can he have been riddling? can we have been riddling? can you have been riddling? can they have been riddling?

Interro-negative form

Simple form	V-ing form
can I not riddle? can you not riddle? can he not riddle? can we not riddle? can you not riddle? can they not riddle?	can I not be riddling? can you not be riddling? can he not be riddling? can we not be riddling? can you not be riddling? can they not be riddling?
Perfect	V-ing perfect
can I not have riddled? can you not have riddled? can he not have riddled? can we not have riddled? can you not have riddled? can they not have riddled?	can I not have been riddling? can you not have been riddling? can he not have been riddling? can we not have been riddling? can you not have been riddling? can they not have been riddling?