could seal
Regular verb: seal - sealed- sealed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could seal
you could seal
he could seal
we could seal
you could seal
they could seal 	I could be sealing
you could be sealing
he could be sealing
we could be sealing
you could be sealing
they could be sealing	I could have sealed
you could have sealed
he 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
he 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
he 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
he 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
he 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
he 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 he seal?
could we seal?
could you seal?
could they seal? 	could I be sealing?
could you be sealing?
could he be sealing?
could we be sealing?
could you be sealing?
could they be sealing? 	could I have sealed?
could you have sealed?
could he 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 he 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 he 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 he 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 he 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 he have been sealing?
couldn't we have been sealing?
couldn't you have been sealing?
couldn't they have been sealing?