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 may not crackle you may not crackle he may not crackle we may not crackle you may not crackle they may not crackle
V-ing form
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
Perfect
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
V-ing perfect
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
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
may I not crackle? may you not crackle? may he not crackle? may we not crackle? may you not crackle? may they not crackle?
V-ing form
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?
Perfect
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?
V-ing perfect
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?