English verb conjugation
COULD BLUB

Regular verb: blub - blubed - blubed

Affirmation

Simple form	V-ing form
I could blub you could blub she could blub we could blub you could blub they could blub	I could be blubing you could be blubing she could be blubing we could be blubing you could be blubing they could be blubing
Perfect	V-ing perfect
I could have blubed you could have blubed she could have blubed we could have blubed you could have blubed they could have blubed	I could have been blubing you could have been blubing she could have been blubing we could have been blubing you could have been blubing they could have been blubing

Negation

Simple form	V-ing form
I couldn't blub you couldn't blub she couldn't blub we couldn't blub you couldn't blub they couldn't blub	I couldn't be blubing you couldn't be blubing she couldn't be blubing we couldn't be blubing you couldn't be blubing they couldn't be blubing
Perfect	V-ing perfect
I couldn't have blubed you couldn't have blubed she couldn't have blubed we couldn't have blubed you couldn't have blubed they couldn't have blubed	I couldn't have been blubing you couldn't have been blubing she couldn't have been blubing we couldn't have been blubing you couldn't have been blubing they couldn't have been blubing

Interrogative form

Simple form	V-ing form
could I blub? could you blub? could she blub? could we blub? could you blub? could they blub?	could I be blubing? could you be blubing? could she be blubing? could we be blubing? could you be blubing? could they be blubing?
Perfect	V-ing perfect
could I have blubed? could you have blubed? could she have blubed? could we have blubed? could you have blubed? could they have blubed?	could I have been blubing? could you have been blubing? could she have been blubing? could we have been blubing? could you have been blubing? could they have been blubing?

Interro-negative form

Simple form	V-ing form
couldn't I blub? couldn't you blub? couldn't she blub? couldn't we blub? couldn't you blub? couldn't they blub?	couldn't I be blubing? couldn't you be blubing? couldn't she be blubing? couldn't we be blubing? couldn't you be blubing? couldn't they be blubing?
Perfect	V-ing perfect
couldn't I have blubed? couldn't you have blubed? couldn't she have blubed? couldn't we have blubed? couldn't you have blubed? couldn't they have blubed?	couldn't I have been blubing? couldn't you have been blubing? couldn't she have been blubing? couldn't we have been blubing? couldn't you have been blubing? couldn't they have been blubing?