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