I could connect you could connect he could connect we could connect you could connect they could connect
V-ing form
I could be connecting you could be connecting he could be connecting we could be connecting you could be connecting they could be connecting
Perfect
I could have connected you could have connected he could have connected we could have connected you could have connected they could have connected
V-ing perfect
I could have been connecting you could have been connecting he could have been connecting we could have been connecting you could have been connecting they could have been connecting
Negation
Simple form
I couldn't connect you couldn't connect he couldn't connect we couldn't connect you couldn't connect they couldn't connect
V-ing form
I couldn't be connecting you couldn't be connecting he couldn't be connecting we couldn't be connecting you couldn't be connecting they couldn't be connecting
Perfect
I couldn't have connected you couldn't have connected he couldn't have connected we couldn't have connected you couldn't have connected they couldn't have connected
V-ing perfect
I couldn't have been connecting you couldn't have been connecting he couldn't have been connecting we couldn't have been connecting you couldn't have been connecting they couldn't have been connecting
Interrogative form
Simple form
could I connect? could you connect? could he connect? could we connect? could you connect? could they connect?
V-ing form
could I be connecting? could you be connecting? could he be connecting? could we be connecting? could you be connecting? could they be connecting?
Perfect
could I have connected? could you have connected? could he have connected? could we have connected? could you have connected? could they have connected?
V-ing perfect
could I have been connecting? could you have been connecting? could he have been connecting? could we have been connecting? could you have been connecting? could they have been connecting?
Interro-negative form
Simple form
couldn't I connect? couldn't you connect? couldn't he connect? couldn't we connect? couldn't you connect? couldn't they connect?
V-ing form
couldn't I be connecting? couldn't you be connecting? couldn't he be connecting? couldn't we be connecting? couldn't you be connecting? couldn't they be connecting?
Perfect
couldn't I have connected? couldn't you have connected? couldn't he have connected? couldn't we have connected? couldn't you have connected? couldn't they have connected?
V-ing perfect
couldn't I have been connecting? couldn't you have been connecting? couldn't he have been connecting? couldn't we have been connecting? couldn't you have been connecting? couldn't they have been connecting?