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