I can obtain you can obtain he can obtain we can obtain you can obtain they can obtain
V-ing form
I can be obtaining you can be obtaining he can be obtaining we can be obtaining you can be obtaining they can be obtaining
Perfect
I can have obtained you can have obtained he can have obtained we can have obtained you can have obtained they can have obtained
V-ing perfect
I can have been obtaining you can have been obtaining he can have been obtaining we can have been obtaining you can have been obtaining they can have been obtaining
Negation
Simple form
I can't obtain you can't obtain he can't obtain we can't obtain you can't obtain they can't obtain
V-ing form
I can't be obtaining you can't be obtaining he can't be obtaining we can't be obtaining you can't be obtaining they can't be obtaining
Perfect
I can't have obtained you can't have obtained he can't have obtained we can't have obtained you can't have obtained they can't have obtained
V-ing perfect
I can't have been obtaining you can't have been obtaining he can't have been obtaining we can't have been obtaining you can't have been obtaining they can't have been obtaining
Interrogative form
Simple form
can I obtain? can you obtain? can he obtain? can we obtain? can you obtain? can they obtain?
V-ing form
can I be obtaining? can you be obtaining? can he be obtaining? can we be obtaining? can you be obtaining? can they be obtaining?
Perfect
can I have obtained? can you have obtained? can he have obtained? can we have obtained? can you have obtained? can they have obtained?
V-ing perfect
can I have been obtaining? can you have been obtaining? can he have been obtaining? can we have been obtaining? can you have been obtaining? can they have been obtaining?
Interro-negative form
Simple form
can't I obtain? can't you obtain? can't he obtain? can't we obtain? can't you obtain? can't they obtain?
V-ing form
can't I be obtaining? can't you be obtaining? can't he be obtaining? can't we be obtaining? can't you be obtaining? can't they be obtaining?
Perfect
can't I have obtained? can't you have obtained? can't he have obtained? can't we have obtained? can't you have obtained? can't they have obtained?
V-ing perfect
can't I have been obtaining? can't you have been obtaining? can't he have been obtaining? can't we have been obtaining? can't you have been obtaining? can't they have been obtaining?