English verb conjugation
COULD MULTIPLY

Regular verb: multiply - multiplied - multiplied

Affirmation

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