"Bedstemoren returnerer sin grønne skjorte."

Translation: The grandmother returns her green shirt.

[MartinMaun1]

Why is it grønne then if it's singular

[Toni27561]

The "e" is added when using the definit and plural forms of the word.

e.g.

Skjørten er grøn.
Den grønne skjorte.
Jeg har tre grønne skjorter.

Byen er gammel.
Vores gamle by.
To gamle byer.

Den der seng er ny.
Hendes/hans nye seng.
Fire nye senge.

I hope this helps.

And yes, "hende"/"han" is used when referring to somebody else.

e.g.

Hun kysser sin man.
= She is kissing her [own] husband

Hun kysser hendes mand.
= She is kissing her [another woman's] husband.

[FyodorPavlovich]

Is it 'hendes grøn skjorte' and 'sin grønne skjorte'?

[Bluthund]

I think "sin" would be her own shirt and "hendes" someone other's (correct me if I'm wrong).

[_Mewtu_]

You are right!

[FabianRxse]

is "return" an object verb?

[fishermanat]

Is "skjorte" means both single and plural form?

[lindaslair]

No, 2 shirts is "skjorter".

[l-christ]

How do we say 'his skirt'?

[DragonNights]

Do you mean "skirt" or "shirt"?