I could beetle you could beetle he could beetle we could beetle you could beetle they could beetle
V-ing form
I could be beetling you could be beetling he could be beetling we could be beetling you could be beetling they could be beetling
Perfect
I could have beetled you could have beetled he could have beetled we could have beetled you could have beetled they could have beetled
V-ing perfect
I could have been beetling you could have been beetling he could have been beetling we could have been beetling you could have been beetling they could have been beetling
Negation
Simple form
I could not beetle you could not beetle he could not beetle we could not beetle you could not beetle they could not beetle
V-ing form
I could not be beetling you could not be beetling he could not be beetling we could not be beetling you could not be beetling they could not be beetling
Perfect
I could not have beetled you could not have beetled he could not have beetled we could not have beetled you could not have beetled they could not have beetled
V-ing perfect
I could not have been beetling you could not have been beetling he could not have been beetling we could not have been beetling you could not have been beetling they could not have been beetling
Interrogative form
Simple form
could I beetle? could you beetle? could he beetle? could we beetle? could you beetle? could they beetle?
V-ing form
could I be beetling? could you be beetling? could he be beetling? could we be beetling? could you be beetling? could they be beetling?
Perfect
could I have beetled? could you have beetled? could he have beetled? could we have beetled? could you have beetled? could they have beetled?
V-ing perfect
could I have been beetling? could you have been beetling? could he have been beetling? could we have been beetling? could you have been beetling? could they have been beetling?
Interro-negative form
Simple form
could I not beetle? could you not beetle? could he not beetle? could we not beetle? could you not beetle? could they not beetle?
V-ing form
could I not be beetling? could you not be beetling? could he not be beetling? could we not be beetling? could you not be beetling? could they not be beetling?
Perfect
could I not have beetled? could you not have beetled? could he not have beetled? could we not have beetled? could you not have beetled? could they not have beetled?
V-ing perfect
could I not have been beetling? could you not have been beetling? could he not have been beetling? could we not have been beetling? could you not have been beetling? could they not have been beetling?