could intern
Regular verb: intern - interned- interned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could intern
you could intern
he could intern
we could intern
you could intern
they could intern 	I could be interning
you could be interning
he could be interning
we could be interning
you could be interning
they could be interning	I could have interned
you could have interned
he 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
he 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 could not intern
you could not intern
he could not intern
we could not intern
you could not intern
they could not intern 	I could not be interning
you could not be interning
he could not be interning
we could not be interning
you could not be interning
they could not be interning	I could not have interned
you could not have interned
he could not have interned
we could not have interned
you could not have interned
they could not have interned	I could not have been interning
you could not have been interning
he could not have been interning
we could not have been interning
you could not have been interning
they could not have been interning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I intern?
could you intern?
could he intern?
could we intern?
could you intern?
could they intern? 	could I be interning?
could you be interning?
could he be interning?
could we be interning?
could you be interning?
could they be interning? 	could I have interned?
could you have interned?
could he 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 he 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 	
could I not intern?
could you not intern?
could he not intern?
could we not intern?
could you not intern?
could they not intern? 	could I not be interning?
could you not be interning?
could he not be interning?
could we not be interning?
could you not be interning?
could they not be interning? 	could I not have interned?
could you not have interned?
could he not have interned?
could we not have interned?
could you not have interned?
could they not have interned? 	could I not have been interning?
could you not have been interning?
could he not have been interning?
could we not have been interning?
could you not have been interning?
could they not have been interning?