I may buckle you may buckle he may buckle we may buckle you may buckle they may buckle
V-ing form
I may be buckling you may be buckling he may be buckling we may be buckling you may be buckling they may be buckling
Perfect
I may have buckled you may have buckled he may have buckled we may have buckled you may have buckled they may have buckled
V-ing perfect
I may have been buckling you may have been buckling he may have been buckling we may have been buckling you may have been buckling they may have been buckling
Negation
Simple form
I mayn't buckle you mayn't buckle he mayn't buckle we mayn't buckle you mayn't buckle they mayn't buckle
V-ing form
I mayn't be buckling you mayn't be buckling he mayn't be buckling we mayn't be buckling you mayn't be buckling they mayn't be buckling
Perfect
I mayn't have buckled you mayn't have buckled he mayn't have buckled we mayn't have buckled you mayn't have buckled they mayn't have buckled
V-ing perfect
I mayn't have been buckling you mayn't have been buckling he mayn't have been buckling we mayn't have been buckling you mayn't have been buckling they mayn't have been buckling
Interrogative form
Simple form
may I buckle? may you buckle? may he buckle? may we buckle? may you buckle? may they buckle?
V-ing form
may I be buckling? may you be buckling? may he be buckling? may we be buckling? may you be buckling? may they be buckling?
Perfect
may I have buckled? may you have buckled? may he have buckled? may we have buckled? may you have buckled? may they have buckled?
V-ing perfect
may I have been buckling? may you have been buckling? may he have been buckling? may we have been buckling? may you have been buckling? may they have been buckling?
Interro-negative form
Simple form
mayn't I buckle? mayn't you buckle? mayn't he buckle? mayn't we buckle? mayn't you buckle? mayn't they buckle?
V-ing form
mayn't I be buckling? mayn't you be buckling? mayn't he be buckling? mayn't we be buckling? mayn't you be buckling? mayn't they be buckling?
Perfect
mayn't I have buckled? mayn't you have buckled? mayn't he have buckled? mayn't we have buckled? mayn't you have buckled? mayn't they have buckled?
V-ing perfect
mayn't I have been buckling? mayn't you have been buckling? mayn't he have been buckling? mayn't we have been buckling? mayn't you have been buckling? mayn't they have been buckling?