could tomb
Regular verb: tomb - tombed- tombed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tomb
you could tomb
she could tomb
we could tomb
you could tomb
they could tomb 	I could be tombing
you could be tombing
she could be tombing
we could be tombing
you could be tombing
they could be tombing	I could have tombed
you could have tombed
she 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
she could have been tombing
we could have been tombing
you could have been tombing
they could have been tombing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tomb
you couldn't tomb
she 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
she 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
she 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
she couldn't have been tombing
we couldn't have been tombing
you couldn't have been tombing
they couldn't have been tombing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tomb?
could you tomb?
could she tomb?
could we tomb?
could you tomb?
could they tomb? 	could I be tombing?
could you be tombing?
could she be tombing?
could we be tombing?
could you be tombing?
could they be tombing? 	could I have tombed?
could you have tombed?
could she 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 she have been tombing?
could we have been tombing?
could you have been tombing?
could they have been tombing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tomb?
couldn't you tomb?
couldn't she 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 she 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 she 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 she have been tombing?
couldn't we have been tombing?
couldn't you have been tombing?
couldn't they have been tombing?