your
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your
Possessive article of the 2nd person singular (informal). It expresses that something belongs to the person being addressed (du form) or is related to them.
Kann ich kurz dein Ladegerät benutzen?
Can I briefly use your charger?
The possessive article 'dein' is declined in the singular just like the indefinite article 'ein'. The endings for case and gender are therefore identical.
Ich brauche einen Regenschirm. Hast du deinen Regenschirm dabei?
I need an umbrella. Do you have your umbrella with you?
'Dein' can also stand alone as a pronoun to replace a noun. It then gets a strong ending that indicates the gender and case of the noun being replaced.
Mein Handy-Akku ist leer. Ist deiner voll?
My phone battery is empty. Is yours full?
'Dein' belongs to the informal form of address 'du'. It is used for friends, family members, children, and in all situations where people use 'du' with each other.
Anna, ich habe gestern dein Buch gelesen.
Anna, I read your book yesterday.
to be
'sein' and 'dein' differ only at the beginning, but they have different functions. 'sein' is a verb and describes a state or quality, or is used as an auxiliary verb. 'dein' is a possessive article and shows that something belongs to the person addressed with 'du'. They are easy to confuse because of their similar form. In a sentence, the surrounding words help: 'dein' usually comes before a noun, for example 'dein Schlüssel' (your key). 'sein' stands as a verb or helps form a verb tense.
Zu Hause liegt dein Heft noch auf dem Küchentisch.
Your notebook is still lying on the kitchen table at home.
Simon ist beim Termin pünktlich und gut vorbereitet.
Simon is on time for the appointment and well prepared.