can underline
Regular verb: underline - underlined- underlined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can underline
you can underline
she can underline
we can underline
you can underline
they can underline 	I can be underlining
you can be underlining
she can be underlining
we can be underlining
you can be underlining
they can be underlining	I can have underlined
you can have underlined
she can have underlined
we can have underlined
you can have underlined
they can have underlined	I can have been underlining
you can have been underlining
she can have been underlining
we can have been underlining
you can have been underlining
they can have been underlining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot underline
you cannot underline
she cannot underline
we cannot underline
you cannot underline
they cannot underline 	I cannot be underlining
you cannot be underlining
she cannot be underlining
we cannot be underlining
you cannot be underlining
they cannot be underlining	I cannot have underlined
you cannot have underlined
she cannot have underlined
we cannot have underlined
you cannot have underlined
they cannot have underlined	I cannot have been underlining
you cannot have been underlining
she cannot have been underlining
we cannot have been underlining
you cannot have been underlining
they cannot have been underlining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I underline?
can you underline?
can she underline?
can we underline?
can you underline?
can they underline? 	can I be underlining?
can you be underlining?
can she be underlining?
can we be underlining?
can you be underlining?
can they be underlining? 	can I have underlined?
can you have underlined?
can she have underlined?
can we have underlined?
can you have underlined?
can they have underlined? 	can I have been underlining?
can you have been underlining?
can she have been underlining?
can we have been underlining?
can you have been underlining?
can they have been underlining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not underline?
can you not underline?
can she not underline?
can we not underline?
can you not underline?
can they not underline? 	can I not be underlining?
can you not be underlining?
can she not be underlining?
can we not be underlining?
can you not be underlining?
can they not be underlining? 	can I not have underlined?
can you not have underlined?
can she not have underlined?
can we not have underlined?
can you not have underlined?
can they not have underlined? 	can I not have been underlining?
can you not have been underlining?
can she not have been underlining?
can we not have been underlining?
can you not have been underlining?
can they not have been underlining?