can grubstake
Regular verb: grubstake - grubstaked- grubstaked

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

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

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

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