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 cannot diagnose
you cannot diagnose
she cannot diagnose
we cannot diagnose
you cannot diagnose
they cannot diagnose 	I cannot be diagnosing
you cannot be diagnosing
she cannot be diagnosing
we cannot be diagnosing
you cannot be diagnosing
they cannot be diagnosing	I cannot have diagnosed
you cannot have diagnosed
she cannot have diagnosed
we cannot have diagnosed
you cannot have diagnosed
they cannot have diagnosed	I cannot have been diagnosing
you cannot have been diagnosing
she cannot have been diagnosing
we cannot have been diagnosing
you cannot have been diagnosing
they cannot 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 I not diagnose?
can you not diagnose?
can she not diagnose?
can we not diagnose?
can you not diagnose?
can they not diagnose? 	can I not be diagnosing?
can you not be diagnosing?
can she not be diagnosing?
can we not be diagnosing?
can you not be diagnosing?
can they not be diagnosing? 	can I not have diagnosed?
can you not have diagnosed?
can she not have diagnosed?
can we not have diagnosed?
can you not have diagnosed?
can they not have diagnosed? 	can I not have been diagnosing?
can you not have been diagnosing?
can she not have been diagnosing?
can we not have been diagnosing?
can you not have been diagnosing?
can they not have been diagnosing?