I can summon you can summon he can summon we can summon you can summon they can summon
V-ing form
I can be summoning you can be summoning he can be summoning we can be summoning you can be summoning they can be summoning
Perfect
I can have summoned you can have summoned he can have summoned we can have summoned you can have summoned they can have summoned
V-ing perfect
I can have been summoning you can have been summoning he can have been summoning we can have been summoning you can have been summoning they can have been summoning
Negation
Simple form
I cannot summon you cannot summon he cannot summon we cannot summon you cannot summon they cannot summon
V-ing form
I cannot be summoning you cannot be summoning he cannot be summoning we cannot be summoning you cannot be summoning they cannot be summoning
Perfect
I cannot have summoned you cannot have summoned he cannot have summoned we cannot have summoned you cannot have summoned they cannot have summoned
V-ing perfect
I cannot have been summoning you cannot have been summoning he cannot have been summoning we cannot have been summoning you cannot have been summoning they cannot have been summoning
Interrogative form
Simple form
can I summon? can you summon? can he summon? can we summon? can you summon? can they summon?
V-ing form
can I be summoning? can you be summoning? can he be summoning? can we be summoning? can you be summoning? can they be summoning?
Perfect
can I have summoned? can you have summoned? can he have summoned? can we have summoned? can you have summoned? can they have summoned?
V-ing perfect
can I have been summoning? can you have been summoning? can he have been summoning? can we have been summoning? can you have been summoning? can they have been summoning?
Interro-negative form
Simple form
can I not summon? can you not summon? can he not summon? can we not summon? can you not summon? can they not summon?
V-ing form
can I not be summoning? can you not be summoning? can he not be summoning? can we not be summoning? can you not be summoning? can they not be summoning?
Perfect
can I not have summoned? can you not have summoned? can he not have summoned? can we not have summoned? can you not have summoned? can they not have summoned?
V-ing perfect
can I not have been summoning? can you not have been summoning? can he not have been summoning? can we not have been summoning? can you not have been summoning? can they not have been summoning?