Ellipsis in linguistics

Hello,


need information about ellipsis (in linguistics).

Do the omissions of
[a subject and the part of predicate; see example (1)]
or
[a subject and a predicate; see example (2)]
or
[the verb's form 'to be'; see example (3)] belong to ellipsis?

E.g.
(1) > Need extra space?
(2) > Swing time.
(3) Late licence > revoked.

Besides, another question is: how to indicate when smth is missing? I mean what mark should be written. I wrote '>', but I think that omissions aren't signed by this mark.

Thank u.