may crackle
Regular verb: crackle - crackled- crackled

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not crackle
you may not crackle
he may not crackle
we may not crackle
you may not crackle
they may not crackle 	I may not be crackling
you may not be crackling
he may not be crackling
we may not be crackling
you may not be crackling
they may not be crackling	I may not have crackled
you may not have crackled
he may not have crackled
we may not have crackled
you may not have crackled
they may not have crackled	I may not have been crackling
you may not have been crackling
he may not have been crackling
we may not have been crackling
you may not have been crackling
they may not have been crackling	

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

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