could overdo
Irregular verb: overdo - overdid- overdone

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't overdo
you couldn't overdo
she 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
she 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
she 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
she 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 she overdo?
could we overdo?
could you overdo?
could they overdo? 	could I be overdoing?
could you be overdoing?
could she be overdoing?
could we be overdoing?
could you be overdoing?
could they be overdoing? 	could I have overdone?
could you have overdone?
could she 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 she 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 she 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 she 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 she 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 she have been overdoing?
couldn't we have been overdoing?
couldn't you have been overdoing?
couldn't they have been overdoing?