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 can't suggest you can't suggest he can't suggest we can't suggest you can't suggest they can't suggest
V-ing form
I can't be suggesting you can't be suggesting he can't be suggesting we can't be suggesting you can't be suggesting they can't be suggesting
Perfect
I can't have suggested you can't have suggested he can't have suggested we can't have suggested you can't have suggested they can't have suggested
V-ing perfect
I can't have been suggesting you can't have been suggesting he can't have been suggesting we can't have been suggesting you can't have been suggesting they can't 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't I suggest? can't you suggest? can't he suggest? can't we suggest? can't you suggest? can't they suggest?
V-ing form
can't I be suggesting? can't you be suggesting? can't he be suggesting? can't we be suggesting? can't you be suggesting? can't they be suggesting?
Perfect
can't I have suggested? can't you have suggested? can't he have suggested? can't we have suggested? can't you have suggested? can't they have suggested?
V-ing perfect
can't I have been suggesting? can't you have been suggesting? can't he have been suggesting? can't we have been suggesting? can't you have been suggesting? can't they have been suggesting?