I could muscle you could muscle he could muscle we could muscle you could muscle they could muscle
V-ing form
I could be muscling you could be muscling he could be muscling we could be muscling you could be muscling they could be muscling
Perfect
I could have muscled you could have muscled he could have muscled we could have muscled you could have muscled they could have muscled
V-ing perfect
I could have been muscling you could have been muscling he could have been muscling we could have been muscling you could have been muscling they could have been muscling
Negation
Simple form
I could not muscle you could not muscle he could not muscle we could not muscle you could not muscle they could not muscle
V-ing form
I could not be muscling you could not be muscling he could not be muscling we could not be muscling you could not be muscling they could not be muscling
Perfect
I could not have muscled you could not have muscled he could not have muscled we could not have muscled you could not have muscled they could not have muscled
V-ing perfect
I could not have been muscling you could not have been muscling he could not have been muscling we could not have been muscling you could not have been muscling they could not have been muscling
Interrogative form
Simple form
could I muscle? could you muscle? could he muscle? could we muscle? could you muscle? could they muscle?
V-ing form
could I be muscling? could you be muscling? could he be muscling? could we be muscling? could you be muscling? could they be muscling?
Perfect
could I have muscled? could you have muscled? could he have muscled? could we have muscled? could you have muscled? could they have muscled?
V-ing perfect
could I have been muscling? could you have been muscling? could he have been muscling? could we have been muscling? could you have been muscling? could they have been muscling?
Interro-negative form
Simple form
could I not muscle? could you not muscle? could he not muscle? could we not muscle? could you not muscle? could they not muscle?
V-ing form
could I not be muscling? could you not be muscling? could he not be muscling? could we not be muscling? could you not be muscling? could they not be muscling?
Perfect
could I not have muscled? could you not have muscled? could he not have muscled? could we not have muscled? could you not have muscled? could they not have muscled?
V-ing perfect
could I not have been muscling? could you not have been muscling? could he not have been muscling? could we not have been muscling? could you not have been muscling? could they not have been muscling?