could grunt
Regular verb: grunt - grunted- grunted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could grunt
you could grunt
she could grunt
we could grunt
you could grunt
they could grunt 	I could be grunting
you could be grunting
she could be grunting
we could be grunting
you could be grunting
they could be grunting	I could have grunted
you could have grunted
she could have grunted
we could have grunted
you could have grunted
they could have grunted	I could have been grunting
you could have been grunting
she could have been grunting
we could have been grunting
you could have been grunting
they could have been grunting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't grunt
you couldn't grunt
she couldn't grunt
we couldn't grunt
you couldn't grunt
they couldn't grunt 	I couldn't be grunting
you couldn't be grunting
she couldn't be grunting
we couldn't be grunting
you couldn't be grunting
they couldn't be grunting	I couldn't have grunted
you couldn't have grunted
she couldn't have grunted
we couldn't have grunted
you couldn't have grunted
they couldn't have grunted	I couldn't have been grunting
you couldn't have been grunting
she couldn't have been grunting
we couldn't have been grunting
you couldn't have been grunting
they couldn't have been grunting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I grunt?
could you grunt?
could she grunt?
could we grunt?
could you grunt?
could they grunt? 	could I be grunting?
could you be grunting?
could she be grunting?
could we be grunting?
could you be grunting?
could they be grunting? 	could I have grunted?
could you have grunted?
could she have grunted?
could we have grunted?
could you have grunted?
could they have grunted? 	could I have been grunting?
could you have been grunting?
could she have been grunting?
could we have been grunting?
could you have been grunting?
could they have been grunting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I grunt?
couldn't you grunt?
couldn't she grunt?
couldn't we grunt?
couldn't you grunt?
couldn't they grunt? 	couldn't I be grunting?
couldn't you be grunting?
couldn't she be grunting?
couldn't we be grunting?
couldn't you be grunting?
couldn't they be grunting? 	couldn't I have grunted?
couldn't you have grunted?
couldn't she have grunted?
couldn't we have grunted?
couldn't you have grunted?
couldn't they have grunted? 	couldn't I have been grunting?
couldn't you have been grunting?
couldn't she have been grunting?
couldn't we have been grunting?
couldn't you have been grunting?
couldn't they have been grunting?