could surrogate
Regular verb: surrogate - surrogated- surrogated

Affirmation 	
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I could surrogate
you could surrogate
she could surrogate
we could surrogate
you could surrogate
they could surrogate 	I could be surrogating
you could be surrogating
she could be surrogating
we could be surrogating
you could be surrogating
they could be surrogating	I could have surrogated
you could have surrogated
she could have surrogated
we could have surrogated
you could have surrogated
they could have surrogated	I could have been surrogating
you could have been surrogating
she could have been surrogating
we could have been surrogating
you could have been surrogating
they could have been surrogating	

Negation 	
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I couldn't surrogate
you couldn't surrogate
she couldn't surrogate
we couldn't surrogate
you couldn't surrogate
they couldn't surrogate 	I couldn't be surrogating
you couldn't be surrogating
she couldn't be surrogating
we couldn't be surrogating
you couldn't be surrogating
they couldn't be surrogating	I couldn't have surrogated
you couldn't have surrogated
she couldn't have surrogated
we couldn't have surrogated
you couldn't have surrogated
they couldn't have surrogated	I couldn't have been surrogating
you couldn't have been surrogating
she couldn't have been surrogating
we couldn't have been surrogating
you couldn't have been surrogating
they couldn't have been surrogating	

Interrogative form 	
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could I surrogate?
could you surrogate?
could she surrogate?
could we surrogate?
could you surrogate?
could they surrogate? 	could I be surrogating?
could you be surrogating?
could she be surrogating?
could we be surrogating?
could you be surrogating?
could they be surrogating? 	could I have surrogated?
could you have surrogated?
could she have surrogated?
could we have surrogated?
could you have surrogated?
could they have surrogated? 	could I have been surrogating?
could you have been surrogating?
could she have been surrogating?
could we have been surrogating?
could you have been surrogating?
could they have been surrogating? 	

Interro-negative form 	
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couldn't I surrogate?
couldn't you surrogate?
couldn't she surrogate?
couldn't we surrogate?
couldn't you surrogate?
couldn't they surrogate? 	couldn't I be surrogating?
couldn't you be surrogating?
couldn't she be surrogating?
couldn't we be surrogating?
couldn't you be surrogating?
couldn't they be surrogating? 	couldn't I have surrogated?
couldn't you have surrogated?
couldn't she have surrogated?
couldn't we have surrogated?
couldn't you have surrogated?
couldn't they have surrogated? 	couldn't I have been surrogating?
couldn't you have been surrogating?
couldn't she have been surrogating?
couldn't we have been surrogating?
couldn't you have been surrogating?
couldn't they have been surrogating?