could tomb
Verbo regular: tomb - tombed- tombed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could tomb
you could tomb
he could tomb
we could tomb
you could tomb
they could tomb 	I could be tombing
you could be tombing
he could be tombing
we could be tombing
you could be tombing
they could be tombing	I could have tombed
you could have tombed
he could have tombed
we could have tombed
you could have tombed
they could have tombed	I could have been tombing
you could have been tombing
he could have been tombing
we could have been tombing
you could have been tombing
they could have been tombing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't tomb
you couldn't tomb
he couldn't tomb
we couldn't tomb
you couldn't tomb
they couldn't tomb 	I couldn't be tombing
you couldn't be tombing
he couldn't be tombing
we couldn't be tombing
you couldn't be tombing
they couldn't be tombing	I couldn't have tombed
you couldn't have tombed
he couldn't have tombed
we couldn't have tombed
you couldn't have tombed
they couldn't have tombed	I couldn't have been tombing
you couldn't have been tombing
he couldn't have been tombing
we couldn't have been tombing
you couldn't have been tombing
they couldn't have been tombing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I tomb?
could you tomb?
could he tomb?
could we tomb?
could you tomb?
could they tomb? 	could I be tombing?
could you be tombing?
could he be tombing?
could we be tombing?
could you be tombing?
could they be tombing? 	could I have tombed?
could you have tombed?
could he have tombed?
could we have tombed?
could you have tombed?
could they have tombed? 	could I have been tombing?
could you have been tombing?
could he have been tombing?
could we have been tombing?
could you have been tombing?
could they have been tombing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I tomb?
couldn't you tomb?
couldn't he tomb?
couldn't we tomb?
couldn't you tomb?
couldn't they tomb? 	couldn't I be tombing?
couldn't you be tombing?
couldn't he be tombing?
couldn't we be tombing?
couldn't you be tombing?
couldn't they be tombing? 	couldn't I have tombed?
couldn't you have tombed?
couldn't he have tombed?
couldn't we have tombed?
couldn't you have tombed?
couldn't they have tombed? 	couldn't I have been tombing?
couldn't you have been tombing?
couldn't he have been tombing?
couldn't we have been tombing?
couldn't you have been tombing?
couldn't they have been tombing?