could assimilate
Regular verb: assimilate - assimilated- assimilated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could assimilate
you could assimilate
he could assimilate
we could assimilate
you could assimilate
they could assimilate 	I could be assimilating
you could be assimilating
he could be assimilating
we could be assimilating
you could be assimilating
they could be assimilating	I could have assimilated
you could have assimilated
he could have assimilated
we could have assimilated
you could have assimilated
they could have assimilated	I could have been assimilating
you could have been assimilating
he could have been assimilating
we could have been assimilating
you could have been assimilating
they could have been assimilating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't assimilate
you couldn't assimilate
he couldn't assimilate
we couldn't assimilate
you couldn't assimilate
they couldn't assimilate 	I couldn't be assimilating
you couldn't be assimilating
he couldn't be assimilating
we couldn't be assimilating
you couldn't be assimilating
they couldn't be assimilating	I couldn't have assimilated
you couldn't have assimilated
he couldn't have assimilated
we couldn't have assimilated
you couldn't have assimilated
they couldn't have assimilated	I couldn't have been assimilating
you couldn't have been assimilating
he couldn't have been assimilating
we couldn't have been assimilating
you couldn't have been assimilating
they couldn't have been assimilating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I assimilate?
could you assimilate?
could he assimilate?
could we assimilate?
could you assimilate?
could they assimilate? 	could I be assimilating?
could you be assimilating?
could he be assimilating?
could we be assimilating?
could you be assimilating?
could they be assimilating? 	could I have assimilated?
could you have assimilated?
could he have assimilated?
could we have assimilated?
could you have assimilated?
could they have assimilated? 	could I have been assimilating?
could you have been assimilating?
could he have been assimilating?
could we have been assimilating?
could you have been assimilating?
could they have been assimilating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I assimilate?
couldn't you assimilate?
couldn't he assimilate?
couldn't we assimilate?
couldn't you assimilate?
couldn't they assimilate? 	couldn't I be assimilating?
couldn't you be assimilating?
couldn't he be assimilating?
couldn't we be assimilating?
couldn't you be assimilating?
couldn't they be assimilating? 	couldn't I have assimilated?
couldn't you have assimilated?
couldn't he have assimilated?
couldn't we have assimilated?
couldn't you have assimilated?
couldn't they have assimilated? 	couldn't I have been assimilating?
couldn't you have been assimilating?
couldn't he have been assimilating?
couldn't we have been assimilating?
couldn't you have been assimilating?
couldn't they have been assimilating?