I can grill you can grill he can grill we can grill you can grill they can grill
V-ing form
I can be grilling you can be grilling he can be grilling we can be grilling you can be grilling they can be grilling
Perfect
I can have grilled you can have grilled he can have grilled we can have grilled you can have grilled they can have grilled
V-ing perfect
I can have been grilling you can have been grilling he can have been grilling we can have been grilling you can have been grilling they can have been grilling
Negation
Simple form
I can't grill you can't grill he can't grill we can't grill you can't grill they can't grill
V-ing form
I can't be grilling you can't be grilling he can't be grilling we can't be grilling you can't be grilling they can't be grilling
Perfect
I can't have grilled you can't have grilled he can't have grilled we can't have grilled you can't have grilled they can't have grilled
V-ing perfect
I can't have been grilling you can't have been grilling he can't have been grilling we can't have been grilling you can't have been grilling they can't have been grilling
Interrogative form
Simple form
can I grill? can you grill? can he grill? can we grill? can you grill? can they grill?
V-ing form
can I be grilling? can you be grilling? can he be grilling? can we be grilling? can you be grilling? can they be grilling?
Perfect
can I have grilled? can you have grilled? can he have grilled? can we have grilled? can you have grilled? can they have grilled?
V-ing perfect
can I have been grilling? can you have been grilling? can he have been grilling? can we have been grilling? can you have been grilling? can they have been grilling?
Interro-negative form
Simple form
can't I grill? can't you grill? can't he grill? can't we grill? can't you grill? can't they grill?
V-ing form
can't I be grilling? can't you be grilling? can't he be grilling? can't we be grilling? can't you be grilling? can't they be grilling?
Perfect
can't I have grilled? can't you have grilled? can't he have grilled? can't we have grilled? can't you have grilled? can't they have grilled?
V-ing perfect
can't I have been grilling? can't you have been grilling? can't he have been grilling? can't we have been grilling? can't you have been grilling? can't they have been grilling?