English verb conjugation
COULD TOMB

Regular verb: tomb - tombed - tombed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I could not tomb you could not tomb he could not tomb we could not tomb you could not tomb they could not tomb	I could not be tombing you could not be tombing he could not be tombing we could not be tombing you could not be tombing they could not be tombing
Perfect	V-ing perfect
I could not have tombed you could not have tombed he could not have tombed we could not have tombed you could not have tombed they could not have tombed	I could not have been tombing you could not have been tombing he could not have been tombing we could not have been tombing you could not have been tombing they could not have been tombing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
could I not tomb? could you not tomb? could he not tomb? could we not tomb? could you not tomb? could they not tomb?	could I not be tombing? could you not be tombing? could he not be tombing? could we not be tombing? could you not be tombing? could they not be tombing?
Perfect	V-ing perfect
could I not have tombed? could you not have tombed? could he not have tombed? could we not have tombed? could you not have tombed? could they not have tombed?	could I not have been tombing? could you not have been tombing? could he not have been tombing? could we not have been tombing? could you not have been tombing? could they not have been tombing?