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