could underbake
Regular verb: underbake - underbaked- underbaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could underbake
you could underbake
she could underbake
we could underbake
you could underbake
they could underbake 	I could be underbaking
you could be underbaking
she could be underbaking
we could be underbaking
you could be underbaking
they could be underbaking	I could have underbaked
you could have underbaked
she could have underbaked
we could have underbaked
you could have underbaked
they could have underbaked	I could have been underbaking
you could have been underbaking
she could have been underbaking
we could have been underbaking
you could have been underbaking
they could have been underbaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't underbake
you couldn't underbake
she couldn't underbake
we couldn't underbake
you couldn't underbake
they couldn't underbake 	I couldn't be underbaking
you couldn't be underbaking
she couldn't be underbaking
we couldn't be underbaking
you couldn't be underbaking
they couldn't be underbaking	I couldn't have underbaked
you couldn't have underbaked
she couldn't have underbaked
we couldn't have underbaked
you couldn't have underbaked
they couldn't have underbaked	I couldn't have been underbaking
you couldn't have been underbaking
she couldn't have been underbaking
we couldn't have been underbaking
you couldn't have been underbaking
they couldn't have been underbaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I underbake?
could you underbake?
could she underbake?
could we underbake?
could you underbake?
could they underbake? 	could I be underbaking?
could you be underbaking?
could she be underbaking?
could we be underbaking?
could you be underbaking?
could they be underbaking? 	could I have underbaked?
could you have underbaked?
could she have underbaked?
could we have underbaked?
could you have underbaked?
could they have underbaked? 	could I have been underbaking?
could you have been underbaking?
could she have been underbaking?
could we have been underbaking?
could you have been underbaking?
could they have been underbaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I underbake?
couldn't you underbake?
couldn't she underbake?
couldn't we underbake?
couldn't you underbake?
couldn't they underbake? 	couldn't I be underbaking?
couldn't you be underbaking?
couldn't she be underbaking?
couldn't we be underbaking?
couldn't you be underbaking?
couldn't they be underbaking? 	couldn't I have underbaked?
couldn't you have underbaked?
couldn't she have underbaked?
couldn't we have underbaked?
couldn't you have underbaked?
couldn't they have underbaked? 	couldn't I have been underbaking?
couldn't you have been underbaking?
couldn't she have been underbaking?
couldn't we have been underbaking?
couldn't you have been underbaking?
couldn't they have been underbaking?