I can support you can support he can support we can support you can support they can support
V-ing form
I can be supporting you can be supporting he can be supporting we can be supporting you can be supporting they can be supporting
Perfect
I can have supported you can have supported he can have supported we can have supported you can have supported they can have supported
V-ing perfect
I can have been supporting you can have been supporting he can have been supporting we can have been supporting you can have been supporting they can have been supporting
Negation
Simple form
I cannot support you cannot support he cannot support we cannot support you cannot support they cannot support
V-ing form
I cannot be supporting you cannot be supporting he cannot be supporting we cannot be supporting you cannot be supporting they cannot be supporting
Perfect
I cannot have supported you cannot have supported he cannot have supported we cannot have supported you cannot have supported they cannot have supported
V-ing perfect
I cannot have been supporting you cannot have been supporting he cannot have been supporting we cannot have been supporting you cannot have been supporting they cannot have been supporting
Interrogative form
Simple form
can I support? can you support? can he support? can we support? can you support? can they support?
V-ing form
can I be supporting? can you be supporting? can he be supporting? can we be supporting? can you be supporting? can they be supporting?
Perfect
can I have supported? can you have supported? can he have supported? can we have supported? can you have supported? can they have supported?
V-ing perfect
can I have been supporting? can you have been supporting? can he have been supporting? can we have been supporting? can you have been supporting? can they have been supporting?
Interro-negative form
Simple form
can I not support? can you not support? can he not support? can we not support? can you not support? can they not support?
V-ing form
can I not be supporting? can you not be supporting? can he not be supporting? can we not be supporting? can you not be supporting? can they not be supporting?
Perfect
can I not have supported? can you not have supported? can he not have supported? can we not have supported? can you not have supported? can they not have supported?
V-ing perfect
can I not have been supporting? can you not have been supporting? can he not have been supporting? can we not have been supporting? can you not have been supporting? can they not have been supporting?