could sweat
Regular verb: sweat - sweated- sweated

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