could overdo
Irregular verb: overdo - overdid- overdone

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overdo
you could overdo
he could overdo
we could overdo
you could overdo
they could overdo 	I could be overdoing
you could be overdoing
he could be overdoing
we could be overdoing
you could be overdoing
they could be overdoing	I could have overdone
you could have overdone
he could have overdone
we could have overdone
you could have overdone
they could have overdone	I could have been overdoing
you could have been overdoing
he could have been overdoing
we could have been overdoing
you could have been overdoing
they could have been overdoing	

Negation 	
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I couldn't overdo
you couldn't overdo
he couldn't overdo
we couldn't overdo
you couldn't overdo
they couldn't overdo 	I couldn't be overdoing
you couldn't be overdoing
he couldn't be overdoing
we couldn't be overdoing
you couldn't be overdoing
they couldn't be overdoing	I couldn't have overdone
you couldn't have overdone
he couldn't have overdone
we couldn't have overdone
you couldn't have overdone
they couldn't have overdone	I couldn't have been overdoing
you couldn't have been overdoing
he couldn't have been overdoing
we couldn't have been overdoing
you couldn't have been overdoing
they couldn't have been overdoing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overdo?
could you overdo?
could he overdo?
could we overdo?
could you overdo?
could they overdo? 	could I be overdoing?
could you be overdoing?
could he be overdoing?
could we be overdoing?
could you be overdoing?
could they be overdoing? 	could I have overdone?
could you have overdone?
could he have overdone?
could we have overdone?
could you have overdone?
could they have overdone? 	could I have been overdoing?
could you have been overdoing?
could he have been overdoing?
could we have been overdoing?
could you have been overdoing?
could they have been overdoing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I overdo?
couldn't you overdo?
couldn't he overdo?
couldn't we overdo?
couldn't you overdo?
couldn't they overdo? 	couldn't I be overdoing?
couldn't you be overdoing?
couldn't he be overdoing?
couldn't we be overdoing?
couldn't you be overdoing?
couldn't they be overdoing? 	couldn't I have overdone?
couldn't you have overdone?
couldn't he have overdone?
couldn't we have overdone?
couldn't you have overdone?
couldn't they have overdone? 	couldn't I have been overdoing?
couldn't you have been overdoing?
couldn't he have been overdoing?
couldn't we have been overdoing?
couldn't you have been overdoing?
couldn't they have been overdoing?