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 cannot grubstake
you cannot grubstake
she cannot grubstake
we cannot grubstake
you cannot grubstake
they cannot grubstake 	I cannot be grubstaking
you cannot be grubstaking
she cannot be grubstaking
we cannot be grubstaking
you cannot be grubstaking
they cannot be grubstaking	I cannot have grubstaked
you cannot have grubstaked
she cannot have grubstaked
we cannot have grubstaked
you cannot have grubstaked
they cannot have grubstaked	I cannot have been grubstaking
you cannot have been grubstaking
she cannot have been grubstaking
we cannot have been grubstaking
you cannot have been grubstaking
they cannot 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 I not grubstake?
can you not grubstake?
can she not grubstake?
can we not grubstake?
can you not grubstake?
can they not grubstake? 	can I not be grubstaking?
can you not be grubstaking?
can she not be grubstaking?
can we not be grubstaking?
can you not be grubstaking?
can they not be grubstaking? 	can I not have grubstaked?
can you not have grubstaked?
can she not have grubstaked?
can we not have grubstaked?
can you not have grubstaked?
can they not have grubstaked? 	can I not have been grubstaking?
can you not have been grubstaking?
can she not have been grubstaking?
can we not have been grubstaking?
can you not have been grubstaking?
can they not have been grubstaking?