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 couldn't sweat you couldn't sweat he couldn't sweat we couldn't sweat you couldn't sweat they couldn't sweat
V-ing form
I couldn't be sweating you couldn't be sweating he couldn't be sweating we couldn't be sweating you couldn't be sweating they couldn't be sweating
Perfect
I couldn't have sweated you couldn't have sweated he couldn't have sweated we couldn't have sweated you couldn't have sweated they couldn't have sweated
V-ing perfect
I couldn't have been sweating you couldn't have been sweating he couldn't have been sweating we couldn't have been sweating you couldn't have been sweating they couldn't 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
couldn't I sweat? couldn't you sweat? couldn't he sweat? couldn't we sweat? couldn't you sweat? couldn't they sweat?
V-ing form
couldn't I be sweating? couldn't you be sweating? couldn't he be sweating? couldn't we be sweating? couldn't you be sweating? couldn't they be sweating?
Perfect
couldn't I have sweated? couldn't you have sweated? couldn't he have sweated? couldn't we have sweated? couldn't you have sweated? couldn't they have sweated?
V-ing perfect
couldn't I have been sweating? couldn't you have been sweating? couldn't he have been sweating? couldn't we have been sweating? couldn't you have been sweating? couldn't they have been sweating?