A clause always has a subject and a verb. However, in Greek the subject might be omitted. This happens because a verb form always has an ending indicating the subject. Therefore, it is not necessary to use the pronoun (for emphatic use of the pronouns, see pronouns).
Koιτάζει την Μαρία.
When omitted the subject can be understood from the verbal ending and/or the context
You can also read: Word order
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