English verb conjugation
COULD INTRODUCE

Regular verb: introduce - introduced - introduced

Affirmation

Simple form	V-ing form
I could introduce you could introduce she could introduce we could introduce you could introduce they could introduce	I could be introducing you could be introducing she could be introducing we could be introducing you could be introducing they could be introducing
Perfect	V-ing perfect
I could have introduced you could have introduced she could have introduced we could have introduced you could have introduced they could have introduced	I could have been introducing you could have been introducing she could have been introducing we could have been introducing you could have been introducing they could have been introducing

Negation

Simple form	V-ing form
I couldn't introduce you couldn't introduce she couldn't introduce we couldn't introduce you couldn't introduce they couldn't introduce	I couldn't be introducing you couldn't be introducing she couldn't be introducing we couldn't be introducing you couldn't be introducing they couldn't be introducing
Perfect	V-ing perfect
I couldn't have introduced you couldn't have introduced she couldn't have introduced we couldn't have introduced you couldn't have introduced they couldn't have introduced	I couldn't have been introducing you couldn't have been introducing she couldn't have been introducing we couldn't have been introducing you couldn't have been introducing they couldn't have been introducing

Interrogative form

Simple form	V-ing form
could I introduce? could you introduce? could she introduce? could we introduce? could you introduce? could they introduce?	could I be introducing? could you be introducing? could she be introducing? could we be introducing? could you be introducing? could they be introducing?
Perfect	V-ing perfect
could I have introduced? could you have introduced? could she have introduced? could we have introduced? could you have introduced? could they have introduced?	could I have been introducing? could you have been introducing? could she have been introducing? could we have been introducing? could you have been introducing? could they have been introducing?

Interro-negative form

Simple form	V-ing form
couldn't I introduce? couldn't you introduce? couldn't she introduce? couldn't we introduce? couldn't you introduce? couldn't they introduce?	couldn't I be introducing? couldn't you be introducing? couldn't she be introducing? couldn't we be introducing? couldn't you be introducing? couldn't they be introducing?
Perfect	V-ing perfect
couldn't I have introduced? couldn't you have introduced? couldn't she have introduced? couldn't we have introduced? couldn't you have introduced? couldn't they have introduced?	couldn't I have been introducing? couldn't you have been introducing? couldn't she have been introducing? couldn't we have been introducing? couldn't you have been introducing? couldn't they have been introducing?