could seal
Regular verb: seal - sealed- sealed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could seal
you could seal
she could seal
we could seal
you could seal
they could seal 	I could be sealing
you could be sealing
she could be sealing
we could be sealing
you could be sealing
they could be sealing	I could have sealed
you could have sealed
she could have sealed
we could have sealed
you could have sealed
they could have sealed	I could have been sealing
you could have been sealing
she could have been sealing
we could have been sealing
you could have been sealing
they could have been sealing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't seal
you couldn't seal
she couldn't seal
we couldn't seal
you couldn't seal
they couldn't seal 	I couldn't be sealing
you couldn't be sealing
she couldn't be sealing
we couldn't be sealing
you couldn't be sealing
they couldn't be sealing	I couldn't have sealed
you couldn't have sealed
she couldn't have sealed
we couldn't have sealed
you couldn't have sealed
they couldn't have sealed	I couldn't have been sealing
you couldn't have been sealing
she couldn't have been sealing
we couldn't have been sealing
you couldn't have been sealing
they couldn't have been sealing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I seal?
could you seal?
could she seal?
could we seal?
could you seal?
could they seal? 	could I be sealing?
could you be sealing?
could she be sealing?
could we be sealing?
could you be sealing?
could they be sealing? 	could I have sealed?
could you have sealed?
could she have sealed?
could we have sealed?
could you have sealed?
could they have sealed? 	could I have been sealing?
could you have been sealing?
could she have been sealing?
could we have been sealing?
could you have been sealing?
could they have been sealing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I seal?
couldn't you seal?
couldn't she seal?
couldn't we seal?
couldn't you seal?
couldn't they seal? 	couldn't I be sealing?
couldn't you be sealing?
couldn't she be sealing?
couldn't we be sealing?
couldn't you be sealing?
couldn't they be sealing? 	couldn't I have sealed?
couldn't you have sealed?
couldn't she have sealed?
couldn't we have sealed?
couldn't you have sealed?
couldn't they have sealed? 	couldn't I have been sealing?
couldn't you have been sealing?
couldn't she have been sealing?
couldn't we have been sealing?
couldn't you have been sealing?
couldn't they have been sealing?