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