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