could spam
Regular verb: spam - spamed- spamed

Affirmation 	
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I could spam
you could spam
he could spam
we could spam
you could spam
they could spam 	I could be spaming
you could be spaming
he could be spaming
we could be spaming
you could be spaming
they could be spaming	I could have spamed
you could have spamed
he could have spamed
we could have spamed
you could have spamed
they could have spamed	I could have been spaming
you could have been spaming
he could have been spaming
we could have been spaming
you could have been spaming
they could have been spaming	

Negation 	
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I couldn't spam
you couldn't spam
he couldn't spam
we couldn't spam
you couldn't spam
they couldn't spam 	I couldn't be spaming
you couldn't be spaming
he couldn't be spaming
we couldn't be spaming
you couldn't be spaming
they couldn't be spaming	I couldn't have spamed
you couldn't have spamed
he couldn't have spamed
we couldn't have spamed
you couldn't have spamed
they couldn't have spamed	I couldn't have been spaming
you couldn't have been spaming
he couldn't have been spaming
we couldn't have been spaming
you couldn't have been spaming
they couldn't have been spaming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I spam?
could you spam?
could he spam?
could we spam?
could you spam?
could they spam? 	could I be spaming?
could you be spaming?
could he be spaming?
could we be spaming?
could you be spaming?
could they be spaming? 	could I have spamed?
could you have spamed?
could he have spamed?
could we have spamed?
could you have spamed?
could they have spamed? 	could I have been spaming?
could you have been spaming?
could he have been spaming?
could we have been spaming?
could you have been spaming?
could they have been spaming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I spam?
couldn't you spam?
couldn't he spam?
couldn't we spam?
couldn't you spam?
couldn't they spam? 	couldn't I be spaming?
couldn't you be spaming?
couldn't he be spaming?
couldn't we be spaming?
couldn't you be spaming?
couldn't they be spaming? 	couldn't I have spamed?
couldn't you have spamed?
couldn't he have spamed?
couldn't we have spamed?
couldn't you have spamed?
couldn't they have spamed? 	couldn't I have been spaming?
couldn't you have been spaming?
couldn't he have been spaming?
couldn't we have been spaming?
couldn't you have been spaming?
couldn't they have been spaming?