could overstress
Regular verb: overstress - overstressed- overstressed

Affirmation 	
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I could overstress
you could overstress
he could overstress
we could overstress
you could overstress
they could overstress 	I could be overstressing
you could be overstressing
he could be overstressing
we could be overstressing
you could be overstressing
they could be overstressing	I could have overstressed
you could have overstressed
he could have overstressed
we could have overstressed
you could have overstressed
they could have overstressed	I could have been overstressing
you could have been overstressing
he could have been overstressing
we could have been overstressing
you could have been overstressing
they could have been overstressing	

Negation 	
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I couldn't overstress
you couldn't overstress
he couldn't overstress
we couldn't overstress
you couldn't overstress
they couldn't overstress 	I couldn't be overstressing
you couldn't be overstressing
he couldn't be overstressing
we couldn't be overstressing
you couldn't be overstressing
they couldn't be overstressing	I couldn't have overstressed
you couldn't have overstressed
he couldn't have overstressed
we couldn't have overstressed
you couldn't have overstressed
they couldn't have overstressed	I couldn't have been overstressing
you couldn't have been overstressing
he couldn't have been overstressing
we couldn't have been overstressing
you couldn't have been overstressing
they couldn't have been overstressing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overstress?
could you overstress?
could he overstress?
could we overstress?
could you overstress?
could they overstress? 	could I be overstressing?
could you be overstressing?
could he be overstressing?
could we be overstressing?
could you be overstressing?
could they be overstressing? 	could I have overstressed?
could you have overstressed?
could he have overstressed?
could we have overstressed?
could you have overstressed?
could they have overstressed? 	could I have been overstressing?
could you have been overstressing?
could he have been overstressing?
could we have been overstressing?
could you have been overstressing?
could they have been overstressing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I overstress?
couldn't you overstress?
couldn't he overstress?
couldn't we overstress?
couldn't you overstress?
couldn't they overstress? 	couldn't I be overstressing?
couldn't you be overstressing?
couldn't he be overstressing?
couldn't we be overstressing?
couldn't you be overstressing?
couldn't they be overstressing? 	couldn't I have overstressed?
couldn't you have overstressed?
couldn't he have overstressed?
couldn't we have overstressed?
couldn't you have overstressed?
couldn't they have overstressed? 	couldn't I have been overstressing?
couldn't you have been overstressing?
couldn't he have been overstressing?
couldn't we have been overstressing?
couldn't you have been overstressing?
couldn't they have been overstressing?