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 mayn't crackle
you mayn't crackle
he mayn't crackle
we mayn't crackle
you mayn't crackle
they mayn't crackle 	I mayn't be crackling
you mayn't be crackling
he mayn't be crackling
we mayn't be crackling
you mayn't be crackling
they mayn't be crackling	I mayn't have crackled
you mayn't have crackled
he mayn't have crackled
we mayn't have crackled
you mayn't have crackled
they mayn't have crackled	I mayn't have been crackling
you mayn't have been crackling
he mayn't have been crackling
we mayn't have been crackling
you mayn't have been crackling
they mayn't 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 	
mayn't I crackle?
mayn't you crackle?
mayn't he crackle?
mayn't we crackle?
mayn't you crackle?
mayn't they crackle? 	mayn't I be crackling?
mayn't you be crackling?
mayn't he be crackling?
mayn't we be crackling?
mayn't you be crackling?
mayn't they be crackling? 	mayn't I have crackled?
mayn't you have crackled?
mayn't he have crackled?
mayn't we have crackled?
mayn't you have crackled?
mayn't they have crackled? 	mayn't I have been crackling?
mayn't you have been crackling?
mayn't he have been crackling?
mayn't we have been crackling?
mayn't you have been crackling?
mayn't they have been crackling?