English verb conjugation
COULD HALLO

Regular verb: hallo - halloed - halloed

Affirmation

Simple form	V-ing form
I could hallo you could hallo he could hallo we could hallo you could hallo they could hallo	I could be halloing you could be halloing he could be halloing we could be halloing you could be halloing they could be halloing
Perfect	V-ing perfect
I could have halloed you could have halloed he could have halloed we could have halloed you could have halloed they could have halloed	I could have been halloing you could have been halloing he could have been halloing we could have been halloing you could have been halloing they could have been halloing

Negation

Simple form	V-ing form
I could not hallo you could not hallo he could not hallo we could not hallo you could not hallo they could not hallo	I could not be halloing you could not be halloing he could not be halloing we could not be halloing you could not be halloing they could not be halloing
Perfect	V-ing perfect
I could not have halloed you could not have halloed he could not have halloed we could not have halloed you could not have halloed they could not have halloed	I could not have been halloing you could not have been halloing he could not have been halloing we could not have been halloing you could not have been halloing they could not have been halloing

Interrogative form

Simple form	V-ing form
could I hallo? could you hallo? could he hallo? could we hallo? could you hallo? could they hallo?	could I be halloing? could you be halloing? could he be halloing? could we be halloing? could you be halloing? could they be halloing?
Perfect	V-ing perfect
could I have halloed? could you have halloed? could he have halloed? could we have halloed? could you have halloed? could they have halloed?	could I have been halloing? could you have been halloing? could he have been halloing? could we have been halloing? could you have been halloing? could they have been halloing?

Interro-negative form

Simple form	V-ing form
could I not hallo? could you not hallo? could he not hallo? could we not hallo? could you not hallo? could they not hallo?	could I not be halloing? could you not be halloing? could he not be halloing? could we not be halloing? could you not be halloing? could they not be halloing?
Perfect	V-ing perfect
could I not have halloed? could you not have halloed? could he not have halloed? could we not have halloed? could you not have halloed? could they not have halloed?	could I not have been halloing? could you not have been halloing? could he not have been halloing? could we not have been halloing? could you not have been halloing? could they not have been halloing?