can diagnose
Regular verb: diagnose - diagnosed- diagnosed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can diagnose
you can diagnose
she can diagnose
we can diagnose
you can diagnose
they can diagnose 	I can be diagnosing
you can be diagnosing
she can be diagnosing
we can be diagnosing
you can be diagnosing
they can be diagnosing	I can have diagnosed
you can have diagnosed
she can have diagnosed
we can have diagnosed
you can have diagnosed
they can have diagnosed	I can have been diagnosing
you can have been diagnosing
she can have been diagnosing
we can have been diagnosing
you can have been diagnosing
they can have been diagnosing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't diagnose
you can't diagnose
she can't diagnose
we can't diagnose
you can't diagnose
they can't diagnose 	I can't be diagnosing
you can't be diagnosing
she can't be diagnosing
we can't be diagnosing
you can't be diagnosing
they can't be diagnosing	I can't have diagnosed
you can't have diagnosed
she can't have diagnosed
we can't have diagnosed
you can't have diagnosed
they can't have diagnosed	I can't have been diagnosing
you can't have been diagnosing
she can't have been diagnosing
we can't have been diagnosing
you can't have been diagnosing
they can't have been diagnosing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I diagnose?
can you diagnose?
can she diagnose?
can we diagnose?
can you diagnose?
can they diagnose? 	can I be diagnosing?
can you be diagnosing?
can she be diagnosing?
can we be diagnosing?
can you be diagnosing?
can they be diagnosing? 	can I have diagnosed?
can you have diagnosed?
can she have diagnosed?
can we have diagnosed?
can you have diagnosed?
can they have diagnosed? 	can I have been diagnosing?
can you have been diagnosing?
can she have been diagnosing?
can we have been diagnosing?
can you have been diagnosing?
can they have been diagnosing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I diagnose?
can't you diagnose?
can't she diagnose?
can't we diagnose?
can't you diagnose?
can't they diagnose? 	can't I be diagnosing?
can't you be diagnosing?
can't she be diagnosing?
can't we be diagnosing?
can't you be diagnosing?
can't they be diagnosing? 	can't I have diagnosed?
can't you have diagnosed?
can't she have diagnosed?
can't we have diagnosed?
can't you have diagnosed?
can't they have diagnosed? 	can't I have been diagnosing?
can't you have been diagnosing?
can't she have been diagnosing?
can't we have been diagnosing?
can't you have been diagnosing?
can't they have been diagnosing?