can riddle
Regular verb: riddle - riddled- riddled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?