I could influence you could influence she could influence we could influence you could influence they could influence
V-ing form
I could be influencing you could be influencing she could be influencing we could be influencing you could be influencing they could be influencing
Perfect
I could have influenced you could have influenced she could have influenced we could have influenced you could have influenced they could have influenced
V-ing perfect
I could have been influencing you could have been influencing she could have been influencing we could have been influencing you could have been influencing they could have been influencing
Negation
Simple form
I couldn't influence you couldn't influence she couldn't influence we couldn't influence you couldn't influence they couldn't influence
V-ing form
I couldn't be influencing you couldn't be influencing she couldn't be influencing we couldn't be influencing you couldn't be influencing they couldn't be influencing
Perfect
I couldn't have influenced you couldn't have influenced she couldn't have influenced we couldn't have influenced you couldn't have influenced they couldn't have influenced
V-ing perfect
I couldn't have been influencing you couldn't have been influencing she couldn't have been influencing we couldn't have been influencing you couldn't have been influencing they couldn't have been influencing
Interrogative form
Simple form
could I influence? could you influence? could she influence? could we influence? could you influence? could they influence?
V-ing form
could I be influencing? could you be influencing? could she be influencing? could we be influencing? could you be influencing? could they be influencing?
Perfect
could I have influenced? could you have influenced? could she have influenced? could we have influenced? could you have influenced? could they have influenced?
V-ing perfect
could I have been influencing? could you have been influencing? could she have been influencing? could we have been influencing? could you have been influencing? could they have been influencing?
Interro-negative form
Simple form
couldn't I influence? couldn't you influence? couldn't she influence? couldn't we influence? couldn't you influence? couldn't they influence?
V-ing form
couldn't I be influencing? couldn't you be influencing? couldn't she be influencing? couldn't we be influencing? couldn't you be influencing? couldn't they be influencing?
Perfect
couldn't I have influenced? couldn't you have influenced? couldn't she have influenced? couldn't we have influenced? couldn't you have influenced? couldn't they have influenced?
V-ing perfect
couldn't I have been influencing? couldn't you have been influencing? couldn't she have been influencing? couldn't we have been influencing? couldn't you have been influencing? couldn't they have been influencing?