I could employ you could employ he could employ we could employ you could employ they could employ
V-ing form
I could be employing you could be employing he could be employing we could be employing you could be employing they could be employing
Perfect
I could have employed you could have employed he 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 he 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 he 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 he 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 he 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 he 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 he employ? could we employ? could you employ? could they employ?
V-ing form
could I be employing? could you be employing? could he be employing? could we be employing? could you be employing? could they be employing?
Perfect
could I have employed? could you have employed? could he 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 he 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 he 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 he 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 he 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 he have been employing? couldn't we have been employing? couldn't you have been employing? couldn't they have been employing?