I could recommend you could recommend he could recommend we could recommend you could recommend they could recommend
V-ing form
I could be recommending you could be recommending he could be recommending we could be recommending you could be recommending they could be recommending
Perfect
I could have recommended you could have recommended he could have recommended we could have recommended you could have recommended they could have recommended
V-ing perfect
I could have been recommending you could have been recommending he could have been recommending we could have been recommending you could have been recommending they could have been recommending
Negation
Simple form
I could not recommend you could not recommend he could not recommend we could not recommend you could not recommend they could not recommend
V-ing form
I could not be recommending you could not be recommending he could not be recommending we could not be recommending you could not be recommending they could not be recommending
Perfect
I could not have recommended you could not have recommended he could not have recommended we could not have recommended you could not have recommended they could not have recommended
V-ing perfect
I could not have been recommending you could not have been recommending he could not have been recommending we could not have been recommending you could not have been recommending they could not have been recommending
Interrogative form
Simple form
could I recommend? could you recommend? could he recommend? could we recommend? could you recommend? could they recommend?
V-ing form
could I be recommending? could you be recommending? could he be recommending? could we be recommending? could you be recommending? could they be recommending?
Perfect
could I have recommended? could you have recommended? could he have recommended? could we have recommended? could you have recommended? could they have recommended?
V-ing perfect
could I have been recommending? could you have been recommending? could he have been recommending? could we have been recommending? could you have been recommending? could they have been recommending?
Interro-negative form
Simple form
could I not recommend? could you not recommend? could he not recommend? could we not recommend? could you not recommend? could they not recommend?
V-ing form
could I not be recommending? could you not be recommending? could he not be recommending? could we not be recommending? could you not be recommending? could they not be recommending?
Perfect
could I not have recommended? could you not have recommended? could he not have recommended? could we not have recommended? could you not have recommended? could they not have recommended?
V-ing perfect
could I not have been recommending? could you not have been recommending? could he not have been recommending? could we not have been recommending? could you not have been recommending? could they not have been recommending?