can crackle
Regular verb: crackle - crackled- crackled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can crackle
you can crackle
he can crackle
we can crackle
you can crackle
they can crackle 	I can be crackling
you can be crackling
he can be crackling
we can be crackling
you can be crackling
they can be crackling	I can have crackled
you can have crackled
he can have crackled
we can have crackled
you can have crackled
they can have crackled	I can have been crackling
you can have been crackling
he can have been crackling
we can have been crackling
you can have been crackling
they can have been crackling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't crackle
you can't crackle
he can't crackle
we can't crackle
you can't crackle
they can't crackle 	I can't be crackling
you can't be crackling
he can't be crackling
we can't be crackling
you can't be crackling
they can't be crackling	I can't have crackled
you can't have crackled
he can't have crackled
we can't have crackled
you can't have crackled
they can't have crackled	I can't have been crackling
you can't have been crackling
he can't have been crackling
we can't have been crackling
you can't have been crackling
they can't have been crackling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I crackle?
can you crackle?
can he crackle?
can we crackle?
can you crackle?
can they crackle? 	can I be crackling?
can you be crackling?
can he be crackling?
can we be crackling?
can you be crackling?
can they be crackling? 	can I have crackled?
can you have crackled?
can he have crackled?
can we have crackled?
can you have crackled?
can they have crackled? 	can I have been crackling?
can you have been crackling?
can he have been crackling?
can we have been crackling?
can you have been crackling?
can they have been crackling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I crackle?
can't you crackle?
can't he crackle?
can't we crackle?
can't you crackle?
can't they crackle? 	can't I be crackling?
can't you be crackling?
can't he be crackling?
can't we be crackling?
can't you be crackling?
can't they be crackling? 	can't I have crackled?
can't you have crackled?
can't he have crackled?
can't we have crackled?
can't you have crackled?
can't they have crackled? 	can't I have been crackling?
can't you have been crackling?
can't he have been crackling?
can't we have been crackling?
can't you have been crackling?
can't they have been crackling?