I can hello you can hello she can hello we can hello you can hello they can hello
V-ing form
I can be helloing you can be helloing she can be helloing we can be helloing you can be helloing they can be helloing
Perfect
I can have helloed you can have helloed she can have helloed we can have helloed you can have helloed they can have helloed
V-ing perfect
I can have been helloing you can have been helloing she can have been helloing we can have been helloing you can have been helloing they can have been helloing
Negation
Simple form
I cannot hello you cannot hello she cannot hello we cannot hello you cannot hello they cannot hello
V-ing form
I cannot be helloing you cannot be helloing she cannot be helloing we cannot be helloing you cannot be helloing they cannot be helloing
Perfect
I cannot have helloed you cannot have helloed she cannot have helloed we cannot have helloed you cannot have helloed they cannot have helloed
V-ing perfect
I cannot have been helloing you cannot have been helloing she cannot have been helloing we cannot have been helloing you cannot have been helloing they cannot have been helloing
Interrogative form
Simple form
can I hello? can you hello? can she hello? can we hello? can you hello? can they hello?
V-ing form
can I be helloing? can you be helloing? can she be helloing? can we be helloing? can you be helloing? can they be helloing?
Perfect
can I have helloed? can you have helloed? can she have helloed? can we have helloed? can you have helloed? can they have helloed?
V-ing perfect
can I have been helloing? can you have been helloing? can she have been helloing? can we have been helloing? can you have been helloing? can they have been helloing?
Interro-negative form
Simple form
can I not hello? can you not hello? can she not hello? can we not hello? can you not hello? can they not hello?
V-ing form
can I not be helloing? can you not be helloing? can she not be helloing? can we not be helloing? can you not be helloing? can they not be helloing?
Perfect
can I not have helloed? can you not have helloed? can she not have helloed? can we not have helloed? can you not have helloed? can they not have helloed?
V-ing perfect
can I not have been helloing? can you not have been helloing? can she not have been helloing? can we not have been helloing? can you not have been helloing? can they not have been helloing?