English verb conjugation
COULD CRASH

Regular verb: crash - crashed - crashed

Affirmation

Simple form	V-ing form
I could crash you could crash she could crash we could crash you could crash they could crash	I could be crashing you could be crashing she could be crashing we could be crashing you could be crashing they could be crashing
Perfect	V-ing perfect
I could have crashed you could have crashed she could have crashed we could have crashed you could have crashed they could have crashed	I could have been crashing you could have been crashing she could have been crashing we could have been crashing you could have been crashing they could have been crashing

Negation

Simple form	V-ing form
I could not crash you could not crash she could not crash we could not crash you could not crash they could not crash	I could not be crashing you could not be crashing she could not be crashing we could not be crashing you could not be crashing they could not be crashing
Perfect	V-ing perfect
I could not have crashed you could not have crashed she could not have crashed we could not have crashed you could not have crashed they could not have crashed	I could not have been crashing you could not have been crashing she could not have been crashing we could not have been crashing you could not have been crashing they could not have been crashing

Interrogative form

Simple form	V-ing form
could I crash? could you crash? could she crash? could we crash? could you crash? could they crash?	could I be crashing? could you be crashing? could she be crashing? could we be crashing? could you be crashing? could they be crashing?
Perfect	V-ing perfect
could I have crashed? could you have crashed? could she have crashed? could we have crashed? could you have crashed? could they have crashed?	could I have been crashing? could you have been crashing? could she have been crashing? could we have been crashing? could you have been crashing? could they have been crashing?

Interro-negative form

Simple form	V-ing form
could I not crash? could you not crash? could she not crash? could we not crash? could you not crash? could they not crash?	could I not be crashing? could you not be crashing? could she not be crashing? could we not be crashing? could you not be crashing? could they not be crashing?
Perfect	V-ing perfect
could I not have crashed? could you not have crashed? could she not have crashed? could we not have crashed? could you not have crashed? could they not have crashed?	could I not have been crashing? could you not have been crashing? could she not have been crashing? could we not have been crashing? could you not have been crashing? could they not have been crashing?