These sentences will all be translated into Japanese using an appropriate noun and the word desu.
~ desu = It is..
|じゅうにじ はん です |
(Juuniji han desu)
|(It) is half past twelve|
|がくせい です |
|(I) am a student|
|(My major) is the Japanese language.|
Note that none of these sentences has a “subject”, like the “it”, “I”, and “my major”, found in their English counterparts. Sentences without subjects are very common in Japanese; Japanese speakers actually tend to omit subjects whenever they think it is clear to the listener what or who they are referring to.