I can suggest you can suggest he can suggest we can suggest you can suggest they can suggest
V-ing form
I can be suggesting you can be suggesting he can be suggesting we can be suggesting you can be suggesting they can be suggesting
Perfect
I can have suggested you can have suggested he can have suggested we can have suggested you can have suggested they can have suggested
V-ing perfect
I can have been suggesting you can have been suggesting he can have been suggesting we can have been suggesting you can have been suggesting they can have been suggesting
Negation
Simple form
I cannot suggest you cannot suggest he cannot suggest we cannot suggest you cannot suggest they cannot suggest
V-ing form
I cannot be suggesting you cannot be suggesting he cannot be suggesting we cannot be suggesting you cannot be suggesting they cannot be suggesting
Perfect
I cannot have suggested you cannot have suggested he cannot have suggested we cannot have suggested you cannot have suggested they cannot have suggested
V-ing perfect
I cannot have been suggesting you cannot have been suggesting he cannot have been suggesting we cannot have been suggesting you cannot have been suggesting they cannot have been suggesting
Interrogative form
Simple form
can I suggest? can you suggest? can he suggest? can we suggest? can you suggest? can they suggest?
V-ing form
can I be suggesting? can you be suggesting? can he be suggesting? can we be suggesting? can you be suggesting? can they be suggesting?
Perfect
can I have suggested? can you have suggested? can he have suggested? can we have suggested? can you have suggested? can they have suggested?
V-ing perfect
can I have been suggesting? can you have been suggesting? can he have been suggesting? can we have been suggesting? can you have been suggesting? can they have been suggesting?
Interro-negative form
Simple form
can I not suggest? can you not suggest? can he not suggest? can we not suggest? can you not suggest? can they not suggest?
V-ing form
can I not be suggesting? can you not be suggesting? can he not be suggesting? can we not be suggesting? can you not be suggesting? can they not be suggesting?
Perfect
can I not have suggested? can you not have suggested? can he not have suggested? can we not have suggested? can you not have suggested? can they not have suggested?
V-ing perfect
can I not have been suggesting? can you not have been suggesting? can he not have been suggesting? can we not have been suggesting? can you not have been suggesting? can they not have been suggesting?