could surrogate
Regular verb: surrogate - surrogated- surrogated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could surrogate
you could surrogate
he could surrogate
we could surrogate
you could surrogate
they could surrogate 	I could be surrogating
you could be surrogating
he could be surrogating
we could be surrogating
you could be surrogating
they could be surrogating	I could have surrogated
you could have surrogated
he 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
he could have been surrogating
we could have been surrogating
you could have been surrogating
they could have been surrogating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not surrogate
you could not surrogate
he could not surrogate
we could not surrogate
you could not surrogate
they could not surrogate 	I could not be surrogating
you could not be surrogating
he could not be surrogating
we could not be surrogating
you could not be surrogating
they could not be surrogating	I could not have surrogated
you could not have surrogated
he could not have surrogated
we could not have surrogated
you could not have surrogated
they could not have surrogated	I could not have been surrogating
you could not have been surrogating
he could not have been surrogating
we could not have been surrogating
you could not have been surrogating
they could not have been surrogating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I surrogate?
could you surrogate?
could he surrogate?
could we surrogate?
could you surrogate?
could they surrogate? 	could I be surrogating?
could you be surrogating?
could he be surrogating?
could we be surrogating?
could you be surrogating?
could they be surrogating? 	could I have surrogated?
could you have surrogated?
could he 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 he have been surrogating?
could we have been surrogating?
could you have been surrogating?
could they have been surrogating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not surrogate?
could you not surrogate?
could he not surrogate?
could we not surrogate?
could you not surrogate?
could they not surrogate? 	could I not be surrogating?
could you not be surrogating?
could he not be surrogating?
could we not be surrogating?
could you not be surrogating?
could they not be surrogating? 	could I not have surrogated?
could you not have surrogated?
could he not have surrogated?
could we not have surrogated?
could you not have surrogated?
could they not have surrogated? 	could I not have been surrogating?
could you not have been surrogating?
could he not have been surrogating?
could we not have been surrogating?
could you not have been surrogating?
could they not have been surrogating?