I can greet you can greet she can greet we can greet you can greet they can greet
V-ing form
I can be greeting you can be greeting she can be greeting we can be greeting you can be greeting they can be greeting
Perfect
I can have greeted you can have greeted she can have greeted we can have greeted you can have greeted they can have greeted
V-ing perfect
I can have been greeting you can have been greeting she can have been greeting we can have been greeting you can have been greeting they can have been greeting
Negation
Simple form
I can't greet you can't greet she can't greet we can't greet you can't greet they can't greet
V-ing form
I can't be greeting you can't be greeting she can't be greeting we can't be greeting you can't be greeting they can't be greeting
Perfect
I can't have greeted you can't have greeted she can't have greeted we can't have greeted you can't have greeted they can't have greeted
V-ing perfect
I can't have been greeting you can't have been greeting she can't have been greeting we can't have been greeting you can't have been greeting they can't have been greeting
Interrogative form
Simple form
can I greet? can you greet? can she greet? can we greet? can you greet? can they greet?
V-ing form
can I be greeting? can you be greeting? can she be greeting? can we be greeting? can you be greeting? can they be greeting?
Perfect
can I have greeted? can you have greeted? can she have greeted? can we have greeted? can you have greeted? can they have greeted?
V-ing perfect
can I have been greeting? can you have been greeting? can she have been greeting? can we have been greeting? can you have been greeting? can they have been greeting?
Interro-negative form
Simple form
can't I greet? can't you greet? can't she greet? can't we greet? can't you greet? can't they greet?
V-ing form
can't I be greeting? can't you be greeting? can't she be greeting? can't we be greeting? can't you be greeting? can't they be greeting?
Perfect
can't I have greeted? can't you have greeted? can't she have greeted? can't we have greeted? can't you have greeted? can't they have greeted?
V-ing perfect
can't I have been greeting? can't you have been greeting? can't she have been greeting? can't we have been greeting? can't you have been greeting? can't they have been greeting?