could multiply
Regular verb: multiply - multiplied- multiplied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could multiply
you could multiply
she could multiply
we could multiply
you could multiply
they could multiply 	I could be multiplying
you could be multiplying
she could be multiplying
we could be multiplying
you could be multiplying
they could be multiplying	I could have multiplied
you could have multiplied
she could have multiplied
we could have multiplied
you could have multiplied
they could have multiplied	I could have been multiplying
you could have been multiplying
she could have been multiplying
we could have been multiplying
you could have been multiplying
they could have been multiplying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't multiply
you couldn't multiply
she couldn't multiply
we couldn't multiply
you couldn't multiply
they couldn't multiply 	I couldn't be multiplying
you couldn't be multiplying
she couldn't be multiplying
we couldn't be multiplying
you couldn't be multiplying
they couldn't be multiplying	I couldn't have multiplied
you couldn't have multiplied
she couldn't have multiplied
we couldn't have multiplied
you couldn't have multiplied
they couldn't have multiplied	I couldn't have been multiplying
you couldn't have been multiplying
she couldn't have been multiplying
we couldn't have been multiplying
you couldn't have been multiplying
they couldn't have been multiplying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I multiply?
could you multiply?
could she multiply?
could we multiply?
could you multiply?
could they multiply? 	could I be multiplying?
could you be multiplying?
could she be multiplying?
could we be multiplying?
could you be multiplying?
could they be multiplying? 	could I have multiplied?
could you have multiplied?
could she have multiplied?
could we have multiplied?
could you have multiplied?
could they have multiplied? 	could I have been multiplying?
could you have been multiplying?
could she have been multiplying?
could we have been multiplying?
could you have been multiplying?
could they have been multiplying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I multiply?
couldn't you multiply?
couldn't she multiply?
couldn't we multiply?
couldn't you multiply?
couldn't they multiply? 	couldn't I be multiplying?
couldn't you be multiplying?
couldn't she be multiplying?
couldn't we be multiplying?
couldn't you be multiplying?
couldn't they be multiplying? 	couldn't I have multiplied?
couldn't you have multiplied?
couldn't she have multiplied?
couldn't we have multiplied?
couldn't you have multiplied?
couldn't they have multiplied? 	couldn't I have been multiplying?
couldn't you have been multiplying?
couldn't she have been multiplying?
couldn't we have been multiplying?
couldn't you have been multiplying?
couldn't they have been multiplying?