article

English:

In English, the articles are: a, an, the. “a” and “an” are indefinite, and “the” is definite.
 

Greek:

See here.
 

Hebrew:

The article in Hebrew is a ה prefixed to the front of a noun.  Typically, the ה will be followed by a patah with a dagesh in the following letter.  See here or this video.

הַשָּׁמַיִם

If the next letter is a guttural, the patah will lengthen to a qamats.

הָאָרֶץ