English verb conjugation
COULD TANGO

Regular verb: tango - tangoed - tangoed

Affirmation

Simple form	V-ing form
I could tango you could tango he could tango we could tango you could tango they could tango	I could be tangoing you could be tangoing he could be tangoing we could be tangoing you could be tangoing they could be tangoing
Perfect	V-ing perfect
I could have tangoed you could have tangoed he could have tangoed we could have tangoed you could have tangoed they could have tangoed	I could have been tangoing you could have been tangoing he could have been tangoing we could have been tangoing you could have been tangoing they could have been tangoing

Negation

Simple form	V-ing form
I couldn't tango you couldn't tango he couldn't tango we couldn't tango you couldn't tango they couldn't tango	I couldn't be tangoing you couldn't be tangoing he couldn't be tangoing we couldn't be tangoing you couldn't be tangoing they couldn't be tangoing
Perfect	V-ing perfect
I couldn't have tangoed you couldn't have tangoed he couldn't have tangoed we couldn't have tangoed you couldn't have tangoed they couldn't have tangoed	I couldn't have been tangoing you couldn't have been tangoing he couldn't have been tangoing we couldn't have been tangoing you couldn't have been tangoing they couldn't have been tangoing

Interrogative form

Simple form	V-ing form
could I tango? could you tango? could he tango? could we tango? could you tango? could they tango?	could I be tangoing? could you be tangoing? could he be tangoing? could we be tangoing? could you be tangoing? could they be tangoing?
Perfect	V-ing perfect
could I have tangoed? could you have tangoed? could he have tangoed? could we have tangoed? could you have tangoed? could they have tangoed?	could I have been tangoing? could you have been tangoing? could he have been tangoing? could we have been tangoing? could you have been tangoing? could they have been tangoing?

Interro-negative form

Simple form	V-ing form
couldn't I tango? couldn't you tango? couldn't he tango? couldn't we tango? couldn't you tango? couldn't they tango?	couldn't I be tangoing? couldn't you be tangoing? couldn't he be tangoing? couldn't we be tangoing? couldn't you be tangoing? couldn't they be tangoing?
Perfect	V-ing perfect
couldn't I have tangoed? couldn't you have tangoed? couldn't he have tangoed? couldn't we have tangoed? couldn't you have tangoed? couldn't they have tangoed?	couldn't I have been tangoing? couldn't you have been tangoing? couldn't he have been tangoing? couldn't we have been tangoing? couldn't you have been tangoing? couldn't they have been tangoing?