could intern
Regular verb: intern - interned- interned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could intern
you could intern
she could intern
we could intern
you could intern
they could intern 	I could be interning
you could be interning
she could be interning
we could be interning
you could be interning
they could be interning	I could have interned
you could have interned
she could have interned
we could have interned
you could have interned
they could have interned	I could have been interning
you could have been interning
she could have been interning
we could have been interning
you could have been interning
they could have been interning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't intern
you couldn't intern
she couldn't intern
we couldn't intern
you couldn't intern
they couldn't intern 	I couldn't be interning
you couldn't be interning
she couldn't be interning
we couldn't be interning
you couldn't be interning
they couldn't be interning	I couldn't have interned
you couldn't have interned
she couldn't have interned
we couldn't have interned
you couldn't have interned
they couldn't have interned	I couldn't have been interning
you couldn't have been interning
she couldn't have been interning
we couldn't have been interning
you couldn't have been interning
they couldn't have been interning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I intern?
could you intern?
could she intern?
could we intern?
could you intern?
could they intern? 	could I be interning?
could you be interning?
could she be interning?
could we be interning?
could you be interning?
could they be interning? 	could I have interned?
could you have interned?
could she have interned?
could we have interned?
could you have interned?
could they have interned? 	could I have been interning?
could you have been interning?
could she have been interning?
could we have been interning?
could you have been interning?
could they have been interning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I intern?
couldn't you intern?
couldn't she intern?
couldn't we intern?
couldn't you intern?
couldn't they intern? 	couldn't I be interning?
couldn't you be interning?
couldn't she be interning?
couldn't we be interning?
couldn't you be interning?
couldn't they be interning? 	couldn't I have interned?
couldn't you have interned?
couldn't she have interned?
couldn't we have interned?
couldn't you have interned?
couldn't they have interned? 	couldn't I have been interning?
couldn't you have been interning?
couldn't she have been interning?
couldn't we have been interning?
couldn't you have been interning?
couldn't they have been interning?