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 couldn't sweat you couldn't sweat she 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 she 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 she 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 she 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 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
couldn't I sweat? couldn't you sweat? couldn't she 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 she 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 she 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 she have been sweating? couldn't we have been sweating? couldn't you have been sweating? couldn't they have been sweating?