I may crackle you may crackle he may crackle we may crackle you may crackle they may crackle
V-ing form
I may be crackling you may be crackling he may be crackling we may be crackling you may be crackling they may be crackling
Perfect
I may have crackled you may have crackled he may have crackled we may have crackled you may have crackled they may have crackled
V-ing perfect
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
I mayn't crackle you mayn't crackle he mayn't crackle we mayn't crackle you mayn't crackle they mayn't crackle
V-ing form
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
Perfect
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
V-ing perfect
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
may I crackle? may you crackle? may he crackle? may we crackle? may you crackle? may they crackle?
V-ing form
may I be crackling? may you be crackling? may he be crackling? may we be crackling? may you be crackling? may they be crackling?
Perfect
may I have crackled? may you have crackled? may he have crackled? may we have crackled? may you have crackled? may they have crackled?
V-ing perfect
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
mayn't I crackle? mayn't you crackle? mayn't he crackle? mayn't we crackle? mayn't you crackle? mayn't they crackle?
V-ing form
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?
Perfect
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?
V-ing perfect
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?