may grubstake
Regular verb: grubstake - grubstaked- grubstaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may grubstake
you may grubstake
he may grubstake
we may grubstake
you may grubstake
they may grubstake 	I may be grubstaking
you may be grubstaking
he may be grubstaking
we may be grubstaking
you may be grubstaking
they may be grubstaking	I may have grubstaked
you may have grubstaked
he may have grubstaked
we may have grubstaked
you may have grubstaked
they may have grubstaked	I may have been grubstaking
you may have been grubstaking
he may have been grubstaking
we may have been grubstaking
you may have been grubstaking
they may have been grubstaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't grubstake
you mayn't grubstake
he mayn't grubstake
we mayn't grubstake
you mayn't grubstake
they mayn't grubstake 	I mayn't be grubstaking
you mayn't be grubstaking
he mayn't be grubstaking
we mayn't be grubstaking
you mayn't be grubstaking
they mayn't be grubstaking	I mayn't have grubstaked
you mayn't have grubstaked
he mayn't have grubstaked
we mayn't have grubstaked
you mayn't have grubstaked
they mayn't have grubstaked	I mayn't have been grubstaking
you mayn't have been grubstaking
he mayn't have been grubstaking
we mayn't have been grubstaking
you mayn't have been grubstaking
they mayn't have been grubstaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I grubstake?
may you grubstake?
may he grubstake?
may we grubstake?
may you grubstake?
may they grubstake? 	may I be grubstaking?
may you be grubstaking?
may he be grubstaking?
may we be grubstaking?
may you be grubstaking?
may they be grubstaking? 	may I have grubstaked?
may you have grubstaked?
may he have grubstaked?
may we have grubstaked?
may you have grubstaked?
may they have grubstaked? 	may I have been grubstaking?
may you have been grubstaking?
may he have been grubstaking?
may we have been grubstaking?
may you have been grubstaking?
may they have been grubstaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I grubstake?
mayn't you grubstake?
mayn't he grubstake?
mayn't we grubstake?
mayn't you grubstake?
mayn't they grubstake? 	mayn't I be grubstaking?
mayn't you be grubstaking?
mayn't he be grubstaking?
mayn't we be grubstaking?
mayn't you be grubstaking?
mayn't they be grubstaking? 	mayn't I have grubstaked?
mayn't you have grubstaked?
mayn't he have grubstaked?
mayn't we have grubstaked?
mayn't you have grubstaked?
mayn't they have grubstaked? 	mayn't I have been grubstaking?
mayn't you have been grubstaking?
mayn't he have been grubstaking?
mayn't we have been grubstaking?
mayn't you have been grubstaking?
mayn't they have been grubstaking?