can cogitate
Regular verb: cogitate - cogitated- cogitated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can cogitate
you can cogitate
he can cogitate
we can cogitate
you can cogitate
they can cogitate 	I can be cogitating
you can be cogitating
he can be cogitating
we can be cogitating
you can be cogitating
they can be cogitating	I can have cogitated
you can have cogitated
he can have cogitated
we can have cogitated
you can have cogitated
they can have cogitated	I can have been cogitating
you can have been cogitating
he can have been cogitating
we can have been cogitating
you can have been cogitating
they can have been cogitating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't cogitate
you can't cogitate
he can't cogitate
we can't cogitate
you can't cogitate
they can't cogitate 	I can't be cogitating
you can't be cogitating
he can't be cogitating
we can't be cogitating
you can't be cogitating
they can't be cogitating	I can't have cogitated
you can't have cogitated
he can't have cogitated
we can't have cogitated
you can't have cogitated
they can't have cogitated	I can't have been cogitating
you can't have been cogitating
he can't have been cogitating
we can't have been cogitating
you can't have been cogitating
they can't have been cogitating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I cogitate?
can you cogitate?
can he cogitate?
can we cogitate?
can you cogitate?
can they cogitate? 	can I be cogitating?
can you be cogitating?
can he be cogitating?
can we be cogitating?
can you be cogitating?
can they be cogitating? 	can I have cogitated?
can you have cogitated?
can he have cogitated?
can we have cogitated?
can you have cogitated?
can they have cogitated? 	can I have been cogitating?
can you have been cogitating?
can he have been cogitating?
can we have been cogitating?
can you have been cogitating?
can they have been cogitating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I cogitate?
can't you cogitate?
can't he cogitate?
can't we cogitate?
can't you cogitate?
can't they cogitate? 	can't I be cogitating?
can't you be cogitating?
can't he be cogitating?
can't we be cogitating?
can't you be cogitating?
can't they be cogitating? 	can't I have cogitated?
can't you have cogitated?
can't he have cogitated?
can't we have cogitated?
can't you have cogitated?
can't they have cogitated? 	can't I have been cogitating?
can't you have been cogitating?
can't he have been cogitating?
can't we have been cogitating?
can't you have been cogitating?
can't they have been cogitating?