could fractionate
Regular verb: fractionate - fractionated- fractionated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fractionate
you could fractionate
she could fractionate
we could fractionate
you could fractionate
they could fractionate 	I could be fractionating
you could be fractionating
she could be fractionating
we could be fractionating
you could be fractionating
they could be fractionating	I could have fractionated
you could have fractionated
she could have fractionated
we could have fractionated
you could have fractionated
they could have fractionated	I could have been fractionating
you could have been fractionating
she could have been fractionating
we could have been fractionating
you could have been fractionating
they could have been fractionating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't fractionate
you couldn't fractionate
she couldn't fractionate
we couldn't fractionate
you couldn't fractionate
they couldn't fractionate 	I couldn't be fractionating
you couldn't be fractionating
she couldn't be fractionating
we couldn't be fractionating
you couldn't be fractionating
they couldn't be fractionating	I couldn't have fractionated
you couldn't have fractionated
she couldn't have fractionated
we couldn't have fractionated
you couldn't have fractionated
they couldn't have fractionated	I couldn't have been fractionating
you couldn't have been fractionating
she couldn't have been fractionating
we couldn't have been fractionating
you couldn't have been fractionating
they couldn't have been fractionating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fractionate?
could you fractionate?
could she fractionate?
could we fractionate?
could you fractionate?
could they fractionate? 	could I be fractionating?
could you be fractionating?
could she be fractionating?
could we be fractionating?
could you be fractionating?
could they be fractionating? 	could I have fractionated?
could you have fractionated?
could she have fractionated?
could we have fractionated?
could you have fractionated?
could they have fractionated? 	could I have been fractionating?
could you have been fractionating?
could she have been fractionating?
could we have been fractionating?
could you have been fractionating?
could they have been fractionating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I fractionate?
couldn't you fractionate?
couldn't she fractionate?
couldn't we fractionate?
couldn't you fractionate?
couldn't they fractionate? 	couldn't I be fractionating?
couldn't you be fractionating?
couldn't she be fractionating?
couldn't we be fractionating?
couldn't you be fractionating?
couldn't they be fractionating? 	couldn't I have fractionated?
couldn't you have fractionated?
couldn't she have fractionated?
couldn't we have fractionated?
couldn't you have fractionated?
couldn't they have fractionated? 	couldn't I have been fractionating?
couldn't you have been fractionating?
couldn't she have been fractionating?
couldn't we have been fractionating?
couldn't you have been fractionating?
couldn't they have been fractionating?