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 couldn't hallo you couldn't hallo he couldn't hallo we couldn't hallo you couldn't hallo they couldn't hallo	I couldn't be halloing you couldn't be halloing he couldn't be halloing we couldn't be halloing you couldn't be halloing they couldn't be halloing
Perfect	V-ing perfect
I couldn't have halloed you couldn't have halloed he couldn't have halloed we couldn't have halloed you couldn't have halloed they couldn't have halloed	I couldn't have been halloing you couldn't have been halloing he couldn't have been halloing we couldn't have been halloing you couldn't have been halloing they couldn't 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
couldn't I hallo? couldn't you hallo? couldn't he hallo? couldn't we hallo? couldn't you hallo? couldn't they hallo?	couldn't I be halloing? couldn't you be halloing? couldn't he be halloing? couldn't we be halloing? couldn't you be halloing? couldn't they be halloing?
Perfect	V-ing perfect
couldn't I have halloed? couldn't you have halloed? couldn't he have halloed? couldn't we have halloed? couldn't you have halloed? couldn't they have halloed?	couldn't I have been halloing? couldn't you have been halloing? couldn't he have been halloing? couldn't we have been halloing? couldn't you have been halloing? couldn't they have been halloing?