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 can't crash you can't crash he can't crash we can't crash you can't crash they can't crash	I can't be crashing you can't be crashing he can't be crashing we can't be crashing you can't be crashing they can't be crashing
Perfect	V-ing perfect
I can't have crashed you can't have crashed he can't have crashed we can't have crashed you can't have crashed they can't have crashed	I can't have been crashing you can't have been crashing he can't have been crashing we can't have been crashing you can't have been crashing they can't 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't I crash? can't you crash? can't he crash? can't we crash? can't you crash? can't they crash?	can't I be crashing? can't you be crashing? can't he be crashing? can't we be crashing? can't you be crashing? can't they be crashing?
Perfect	V-ing perfect
can't I have crashed? can't you have crashed? can't he have crashed? can't we have crashed? can't you have crashed? can't they have crashed?	can't I have been crashing? can't you have been crashing? can't he have been crashing? can't we have been crashing? can't you have been crashing? can't they have been crashing?