could swelter
Regular verb: swelter - sweltered- sweltered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could swelter
you could swelter
he could swelter
we could swelter
you could swelter
they could swelter 	I could be sweltering
you could be sweltering
he could be sweltering
we could be sweltering
you could be sweltering
they could be sweltering	I could have sweltered
you could have sweltered
he could have sweltered
we could have sweltered
you could have sweltered
they could have sweltered	I could have been sweltering
you could have been sweltering
he could have been sweltering
we could have been sweltering
you could have been sweltering
they could have been sweltering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not swelter
you could not swelter
he could not swelter
we could not swelter
you could not swelter
they could not swelter 	I could not be sweltering
you could not be sweltering
he could not be sweltering
we could not be sweltering
you could not be sweltering
they could not be sweltering	I could not have sweltered
you could not have sweltered
he could not have sweltered
we could not have sweltered
you could not have sweltered
they could not have sweltered	I could not have been sweltering
you could not have been sweltering
he could not have been sweltering
we could not have been sweltering
you could not have been sweltering
they could not have been sweltering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I swelter?
could you swelter?
could he swelter?
could we swelter?
could you swelter?
could they swelter? 	could I be sweltering?
could you be sweltering?
could he be sweltering?
could we be sweltering?
could you be sweltering?
could they be sweltering? 	could I have sweltered?
could you have sweltered?
could he have sweltered?
could we have sweltered?
could you have sweltered?
could they have sweltered? 	could I have been sweltering?
could you have been sweltering?
could he have been sweltering?
could we have been sweltering?
could you have been sweltering?
could they have been sweltering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not swelter?
could you not swelter?
could he not swelter?
could we not swelter?
could you not swelter?
could they not swelter? 	could I not be sweltering?
could you not be sweltering?
could he not be sweltering?
could we not be sweltering?
could you not be sweltering?
could they not be sweltering? 	could I not have sweltered?
could you not have sweltered?
could he not have sweltered?
could we not have sweltered?
could you not have sweltered?
could they not have sweltered? 	could I not have been sweltering?
could you not have been sweltering?
could he not have been sweltering?
could we not have been sweltering?
could you not have been sweltering?
could they not have been sweltering?