could proposition
Regular verb: proposition - propositioned- propositioned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could proposition
you could proposition
she could proposition
we could proposition
you could proposition
they could proposition 	I could be propositioning
you could be propositioning
she could be propositioning
we could be propositioning
you could be propositioning
they could be propositioning	I could have propositioned
you could have propositioned
she could have propositioned
we could have propositioned
you could have propositioned
they could have propositioned	I could have been propositioning
you could have been propositioning
she could have been propositioning
we could have been propositioning
you could have been propositioning
they could have been propositioning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't proposition
you couldn't proposition
she couldn't proposition
we couldn't proposition
you couldn't proposition
they couldn't proposition 	I couldn't be propositioning
you couldn't be propositioning
she couldn't be propositioning
we couldn't be propositioning
you couldn't be propositioning
they couldn't be propositioning	I couldn't have propositioned
you couldn't have propositioned
she couldn't have propositioned
we couldn't have propositioned
you couldn't have propositioned
they couldn't have propositioned	I couldn't have been propositioning
you couldn't have been propositioning
she couldn't have been propositioning
we couldn't have been propositioning
you couldn't have been propositioning
they couldn't have been propositioning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I proposition?
could you proposition?
could she proposition?
could we proposition?
could you proposition?
could they proposition? 	could I be propositioning?
could you be propositioning?
could she be propositioning?
could we be propositioning?
could you be propositioning?
could they be propositioning? 	could I have propositioned?
could you have propositioned?
could she have propositioned?
could we have propositioned?
could you have propositioned?
could they have propositioned? 	could I have been propositioning?
could you have been propositioning?
could she have been propositioning?
could we have been propositioning?
could you have been propositioning?
could they have been propositioning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I proposition?
couldn't you proposition?
couldn't she proposition?
couldn't we proposition?
couldn't you proposition?
couldn't they proposition? 	couldn't I be propositioning?
couldn't you be propositioning?
couldn't she be propositioning?
couldn't we be propositioning?
couldn't you be propositioning?
couldn't they be propositioning? 	couldn't I have propositioned?
couldn't you have propositioned?
couldn't she have propositioned?
couldn't we have propositioned?
couldn't you have propositioned?
couldn't they have propositioned? 	couldn't I have been propositioning?
couldn't you have been propositioning?
couldn't she have been propositioning?
couldn't we have been propositioning?
couldn't you have been propositioning?
couldn't they have been propositioning?