I could overdose you could overdose she could overdose we could overdose you could overdose they could overdose
V-ing form
I could be overdosing you could be overdosing she could be overdosing we could be overdosing you could be overdosing they could be overdosing
Perfect
I could have overdosed you could have overdosed she could have overdosed we could have overdosed you could have overdosed they could have overdosed
V-ing perfect
I could have been overdosing you could have been overdosing she could have been overdosing we could have been overdosing you could have been overdosing they could have been overdosing
Negation
Simple form
I could not overdose you could not overdose she could not overdose we could not overdose you could not overdose they could not overdose
V-ing form
I could not be overdosing you could not be overdosing she could not be overdosing we could not be overdosing you could not be overdosing they could not be overdosing
Perfect
I could not have overdosed you could not have overdosed she could not have overdosed we could not have overdosed you could not have overdosed they could not have overdosed
V-ing perfect
I could not have been overdosing you could not have been overdosing she could not have been overdosing we could not have been overdosing you could not have been overdosing they could not have been overdosing
Interrogative form
Simple form
could I overdose? could you overdose? could she overdose? could we overdose? could you overdose? could they overdose?
V-ing form
could I be overdosing? could you be overdosing? could she be overdosing? could we be overdosing? could you be overdosing? could they be overdosing?
Perfect
could I have overdosed? could you have overdosed? could she have overdosed? could we have overdosed? could you have overdosed? could they have overdosed?
V-ing perfect
could I have been overdosing? could you have been overdosing? could she have been overdosing? could we have been overdosing? could you have been overdosing? could they have been overdosing?
Interro-negative form
Simple form
could I not overdose? could you not overdose? could she not overdose? could we not overdose? could you not overdose? could they not overdose?
V-ing form
could I not be overdosing? could you not be overdosing? could she not be overdosing? could we not be overdosing? could you not be overdosing? could they not be overdosing?
Perfect
could I not have overdosed? could you not have overdosed? could she not have overdosed? could we not have overdosed? could you not have overdosed? could they not have overdosed?
V-ing perfect
could I not have been overdosing? could you not have been overdosing? could she not have been overdosing? could we not have been overdosing? could you not have been overdosing? could they not have been overdosing?