English verb conjugation
CAN CRASH

Regular verb: crash - crashed - crashed

Affirmation

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

Negation

Simple form	V-ing form
I cannot crash you cannot crash he cannot crash we cannot crash you cannot crash they cannot crash	I cannot be crashing you cannot be crashing he cannot be crashing we cannot be crashing you cannot be crashing they cannot be crashing
Perfect	V-ing perfect
I cannot have crashed you cannot have crashed he cannot have crashed we cannot have crashed you cannot have crashed they cannot have crashed	I cannot have been crashing you cannot have been crashing he cannot have been crashing we cannot have been crashing you cannot have been crashing they cannot have been crashing

Interrogative form

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

Interro-negative form

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