could decrepitate
Regular verb: decrepitate - decrepitated- decrepitated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could decrepitate
you could decrepitate
he could decrepitate
we could decrepitate
you could decrepitate
they could decrepitate 	I could be decrepitating
you could be decrepitating
he could be decrepitating
we could be decrepitating
you could be decrepitating
they could be decrepitating	I could have decrepitated
you could have decrepitated
he could have decrepitated
we could have decrepitated
you could have decrepitated
they could have decrepitated	I could have been decrepitating
you could have been decrepitating
he could have been decrepitating
we could have been decrepitating
you could have been decrepitating
they could have been decrepitating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't decrepitate
you couldn't decrepitate
he couldn't decrepitate
we couldn't decrepitate
you couldn't decrepitate
they couldn't decrepitate 	I couldn't be decrepitating
you couldn't be decrepitating
he couldn't be decrepitating
we couldn't be decrepitating
you couldn't be decrepitating
they couldn't be decrepitating	I couldn't have decrepitated
you couldn't have decrepitated
he couldn't have decrepitated
we couldn't have decrepitated
you couldn't have decrepitated
they couldn't have decrepitated	I couldn't have been decrepitating
you couldn't have been decrepitating
he couldn't have been decrepitating
we couldn't have been decrepitating
you couldn't have been decrepitating
they couldn't have been decrepitating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I decrepitate?
could you decrepitate?
could he decrepitate?
could we decrepitate?
could you decrepitate?
could they decrepitate? 	could I be decrepitating?
could you be decrepitating?
could he be decrepitating?
could we be decrepitating?
could you be decrepitating?
could they be decrepitating? 	could I have decrepitated?
could you have decrepitated?
could he have decrepitated?
could we have decrepitated?
could you have decrepitated?
could they have decrepitated? 	could I have been decrepitating?
could you have been decrepitating?
could he have been decrepitating?
could we have been decrepitating?
could you have been decrepitating?
could they have been decrepitating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I decrepitate?
couldn't you decrepitate?
couldn't he decrepitate?
couldn't we decrepitate?
couldn't you decrepitate?
couldn't they decrepitate? 	couldn't I be decrepitating?
couldn't you be decrepitating?
couldn't he be decrepitating?
couldn't we be decrepitating?
couldn't you be decrepitating?
couldn't they be decrepitating? 	couldn't I have decrepitated?
couldn't you have decrepitated?
couldn't he have decrepitated?
couldn't we have decrepitated?
couldn't you have decrepitated?
couldn't they have decrepitated? 	couldn't I have been decrepitating?
couldn't you have been decrepitating?
couldn't he have been decrepitating?
couldn't we have been decrepitating?
couldn't you have been decrepitating?
couldn't they have been decrepitating?