I could sweat you could sweat she could sweat we could sweat you could sweat they could sweat
V-ing form
I could be sweating you could be sweating she could be sweating we could be sweating you could be sweating they could be sweating
Perfect
I could have sweated you could have sweated she could have sweated we could have sweated you could have sweated they could have sweated
V-ing perfect
I could have been sweating you could have been sweating she could have been sweating we could have been sweating you could have been sweating they could have been sweating
Negation
Simple form
I could not sweat you could not sweat she could not sweat we could not sweat you could not sweat they could not sweat
V-ing form
I could not be sweating you could not be sweating she could not be sweating we could not be sweating you could not be sweating they could not be sweating
Perfect
I could not have sweated you could not have sweated she could not have sweated we could not have sweated you could not have sweated they could not have sweated
V-ing perfect
I could not have been sweating you could not have been sweating she could not have been sweating we could not have been sweating you could not have been sweating they could not have been sweating
Interrogative form
Simple form
could I sweat? could you sweat? could she sweat? could we sweat? could you sweat? could they sweat?
V-ing form
could I be sweating? could you be sweating? could she be sweating? could we be sweating? could you be sweating? could they be sweating?
Perfect
could I have sweated? could you have sweated? could she have sweated? could we have sweated? could you have sweated? could they have sweated?
V-ing perfect
could I have been sweating? could you have been sweating? could she have been sweating? could we have been sweating? could you have been sweating? could they have been sweating?
Interro-negative form
Simple form
could I not sweat? could you not sweat? could she not sweat? could we not sweat? could you not sweat? could they not sweat?
V-ing form
could I not be sweating? could you not be sweating? could she not be sweating? could we not be sweating? could you not be sweating? could they not be sweating?
Perfect
could I not have sweated? could you not have sweated? could she not have sweated? could we not have sweated? could you not have sweated? could they not have sweated?
V-ing perfect
could I not have been sweating? could you not have been sweating? could she not have been sweating? could we not have been sweating? could you not have been sweating? could they not have been sweating?