could introduce
Regular verb: introduce - introduced- introduced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?