could preexamine
Regular verb: preexamine - preexamined- preexamined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could preexamine
you could preexamine
he could preexamine
we could preexamine
you could preexamine
they could preexamine 	I could be preexamining
you could be preexamining
he could be preexamining
we could be preexamining
you could be preexamining
they could be preexamining	I could have preexamined
you could have preexamined
he could have preexamined
we could have preexamined
you could have preexamined
they could have preexamined	I could have been preexamining
you could have been preexamining
he could have been preexamining
we could have been preexamining
you could have been preexamining
they could have been preexamining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't preexamine
you couldn't preexamine
he couldn't preexamine
we couldn't preexamine
you couldn't preexamine
they couldn't preexamine 	I couldn't be preexamining
you couldn't be preexamining
he couldn't be preexamining
we couldn't be preexamining
you couldn't be preexamining
they couldn't be preexamining	I couldn't have preexamined
you couldn't have preexamined
he couldn't have preexamined
we couldn't have preexamined
you couldn't have preexamined
they couldn't have preexamined	I couldn't have been preexamining
you couldn't have been preexamining
he couldn't have been preexamining
we couldn't have been preexamining
you couldn't have been preexamining
they couldn't have been preexamining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I preexamine?
could you preexamine?
could he preexamine?
could we preexamine?
could you preexamine?
could they preexamine? 	could I be preexamining?
could you be preexamining?
could he be preexamining?
could we be preexamining?
could you be preexamining?
could they be preexamining? 	could I have preexamined?
could you have preexamined?
could he have preexamined?
could we have preexamined?
could you have preexamined?
could they have preexamined? 	could I have been preexamining?
could you have been preexamining?
could he have been preexamining?
could we have been preexamining?
could you have been preexamining?
could they have been preexamining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I preexamine?
couldn't you preexamine?
couldn't he preexamine?
couldn't we preexamine?
couldn't you preexamine?
couldn't they preexamine? 	couldn't I be preexamining?
couldn't you be preexamining?
couldn't he be preexamining?
couldn't we be preexamining?
couldn't you be preexamining?
couldn't they be preexamining? 	couldn't I have preexamined?
couldn't you have preexamined?
couldn't he have preexamined?
couldn't we have preexamined?
couldn't you have preexamined?
couldn't they have preexamined? 	couldn't I have been preexamining?
couldn't you have been preexamining?
couldn't he have been preexamining?
couldn't we have been preexamining?
couldn't you have been preexamining?
couldn't they have been preexamining?