could preweigh
Regular verb: preweigh - preweighed- preweighed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could preweigh
you could preweigh
he could preweigh
we could preweigh
you could preweigh
they could preweigh 	I could be preweighing
you could be preweighing
he could be preweighing
we could be preweighing
you could be preweighing
they could be preweighing	I could have preweighed
you could have preweighed
he could have preweighed
we could have preweighed
you could have preweighed
they could have preweighed	I could have been preweighing
you could have been preweighing
he could have been preweighing
we could have been preweighing
you could have been preweighing
they could have been preweighing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't preweigh
you couldn't preweigh
he couldn't preweigh
we couldn't preweigh
you couldn't preweigh
they couldn't preweigh 	I couldn't be preweighing
you couldn't be preweighing
he couldn't be preweighing
we couldn't be preweighing
you couldn't be preweighing
they couldn't be preweighing	I couldn't have preweighed
you couldn't have preweighed
he couldn't have preweighed
we couldn't have preweighed
you couldn't have preweighed
they couldn't have preweighed	I couldn't have been preweighing
you couldn't have been preweighing
he couldn't have been preweighing
we couldn't have been preweighing
you couldn't have been preweighing
they couldn't have been preweighing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I preweigh?
could you preweigh?
could he preweigh?
could we preweigh?
could you preweigh?
could they preweigh? 	could I be preweighing?
could you be preweighing?
could he be preweighing?
could we be preweighing?
could you be preweighing?
could they be preweighing? 	could I have preweighed?
could you have preweighed?
could he have preweighed?
could we have preweighed?
could you have preweighed?
could they have preweighed? 	could I have been preweighing?
could you have been preweighing?
could he have been preweighing?
could we have been preweighing?
could you have been preweighing?
could they have been preweighing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I preweigh?
couldn't you preweigh?
couldn't he preweigh?
couldn't we preweigh?
couldn't you preweigh?
couldn't they preweigh? 	couldn't I be preweighing?
couldn't you be preweighing?
couldn't he be preweighing?
couldn't we be preweighing?
couldn't you be preweighing?
couldn't they be preweighing? 	couldn't I have preweighed?
couldn't you have preweighed?
couldn't he have preweighed?
couldn't we have preweighed?
couldn't you have preweighed?
couldn't they have preweighed? 	couldn't I have been preweighing?
couldn't you have been preweighing?
couldn't he have been preweighing?
couldn't we have been preweighing?
couldn't you have been preweighing?
couldn't they have been preweighing?