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