could underquote
Regular verb: underquote - underquoted- underquoted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could underquote
you could underquote
he could underquote
we could underquote
you could underquote
they could underquote 	I could be underquoting
you could be underquoting
he could be underquoting
we could be underquoting
you could be underquoting
they could be underquoting	I could have underquoted
you could have underquoted
he could have underquoted
we could have underquoted
you could have underquoted
they could have underquoted	I could have been underquoting
you could have been underquoting
he could have been underquoting
we could have been underquoting
you could have been underquoting
they could have been underquoting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't underquote
you couldn't underquote
he couldn't underquote
we couldn't underquote
you couldn't underquote
they couldn't underquote 	I couldn't be underquoting
you couldn't be underquoting
he couldn't be underquoting
we couldn't be underquoting
you couldn't be underquoting
they couldn't be underquoting	I couldn't have underquoted
you couldn't have underquoted
he couldn't have underquoted
we couldn't have underquoted
you couldn't have underquoted
they couldn't have underquoted	I couldn't have been underquoting
you couldn't have been underquoting
he couldn't have been underquoting
we couldn't have been underquoting
you couldn't have been underquoting
they couldn't have been underquoting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I underquote?
could you underquote?
could he underquote?
could we underquote?
could you underquote?
could they underquote? 	could I be underquoting?
could you be underquoting?
could he be underquoting?
could we be underquoting?
could you be underquoting?
could they be underquoting? 	could I have underquoted?
could you have underquoted?
could he have underquoted?
could we have underquoted?
could you have underquoted?
could they have underquoted? 	could I have been underquoting?
could you have been underquoting?
could he have been underquoting?
could we have been underquoting?
could you have been underquoting?
could they have been underquoting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I underquote?
couldn't you underquote?
couldn't he underquote?
couldn't we underquote?
couldn't you underquote?
couldn't they underquote? 	couldn't I be underquoting?
couldn't you be underquoting?
couldn't he be underquoting?
couldn't we be underquoting?
couldn't you be underquoting?
couldn't they be underquoting? 	couldn't I have underquoted?
couldn't you have underquoted?
couldn't he have underquoted?
couldn't we have underquoted?
couldn't you have underquoted?
couldn't they have underquoted? 	couldn't I have been underquoting?
couldn't you have been underquoting?
couldn't he have been underquoting?
couldn't we have been underquoting?
couldn't you have been underquoting?
couldn't they have been underquoting?