could crash
Regular verb: crash - crashed- crashed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could crash
you could crash
he could crash
we could crash
you could crash
they could crash 	I could be crashing
you could be crashing
he could be crashing
we could be crashing
you could be crashing
they could be crashing	I could have crashed
you could have crashed
he 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
he 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 	Perfect 	V-ing perfect 	
I couldn't crash
you couldn't crash
he couldn't crash
we couldn't crash
you couldn't crash
they couldn't crash 	I couldn't be crashing
you couldn't be crashing
he couldn't be crashing
we couldn't be crashing
you couldn't be crashing
they couldn't be crashing	I couldn't have crashed
you couldn't have crashed
he couldn't have crashed
we couldn't have crashed
you couldn't have crashed
they couldn't have crashed	I couldn't have been crashing
you couldn't have been crashing
he couldn't have been crashing
we couldn't have been crashing
you couldn't have been crashing
they couldn't have been crashing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I crash?
could you crash?
could he crash?
could we crash?
could you crash?
could they crash? 	could I be crashing?
could you be crashing?
could he be crashing?
could we be crashing?
could you be crashing?
could they be crashing? 	could I have crashed?
could you have crashed?
could he 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 he 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 	Perfect 	V-ing perfect 	
couldn't I crash?
couldn't you crash?
couldn't he crash?
couldn't we crash?
couldn't you crash?
couldn't they crash? 	couldn't I be crashing?
couldn't you be crashing?
couldn't he be crashing?
couldn't we be crashing?
couldn't you be crashing?
couldn't they be crashing? 	couldn't I have crashed?
couldn't you have crashed?
couldn't he have crashed?
couldn't we have crashed?
couldn't you have crashed?
couldn't they have crashed? 	couldn't I have been crashing?
couldn't you have been crashing?
couldn't he have been crashing?
couldn't we have been crashing?
couldn't you have been crashing?
couldn't they have been crashing?