I could sweat you could sweat he could sweat we could sweat you could sweat they could sweat
V-ing form
I could be sweating you could be sweating he could be sweating we could be sweating you could be sweating they could be sweating
Perfect
I could have sweated you could have sweated he 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 he 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 he 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 he 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 he 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 he 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 he sweat? could we sweat? could you sweat? could they sweat?
V-ing form
could I be sweating? could you be sweating? could he be sweating? could we be sweating? could you be sweating? could they be sweating?
Perfect
could I have sweated? could you have sweated? could he 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 he 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 he 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 he 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 he 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 he not have been sweating? could we not have been sweating? could you not have been sweating? could they not have been sweating?