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