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 can't support you can't support he can't support we can't support you can't support they can't support
V-ing form
I can't be supporting you can't be supporting he can't be supporting we can't be supporting you can't be supporting they can't be supporting
Perfect
I can't have supported you can't have supported he can't have supported we can't have supported you can't have supported they can't have supported
V-ing perfect
I can't have been supporting you can't have been supporting he can't have been supporting we can't have been supporting you can't have been supporting they can't 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't I support? can't you support? can't he support? can't we support? can't you support? can't they support?
V-ing form
can't I be supporting? can't you be supporting? can't he be supporting? can't we be supporting? can't you be supporting? can't they be supporting?
Perfect
can't I have supported? can't you have supported? can't he have supported? can't we have supported? can't you have supported? can't they have supported?
V-ing perfect
can't I have been supporting? can't you have been supporting? can't he have been supporting? can't we have been supporting? can't you have been supporting? can't they have been supporting?