Null-Subject Sentences

If the subject is evident from context, it can be omitted. It applies mainly to personal pronouns. They can be entirely omitted - the suffix of the verb makes it clear who is making the action.
If we omit the personal pronoun or the subject, the sentence's word order may change.
You can use them for emphasis.

Personal pronouns are:
ja - I
ty - you
on/ona/ono - he/she/it
my - we
vy - you
oni/ony - they

Ja som unavená. - I am tired.
Som unavená. - I am tired.

Ty máš veľa práce. - You (singular) have a lot of work.
Máš veľa práce. - You (singular) have a lot of work.