In German
dein
Meaning: your (informal singular)
Example sentences
IstdasdeinAuto?
Is that your car?
DeineIdeeistgut.
Your idea is good.
Grammar note
“Dein” is the informal singular “your”, used with “du”. It takes the same “ein”-type endings as “mein”: “dein Auto” (neuter), “deine Idee” (feminine). For formal “you” (Sie), use “Ihr” instead.
Common mistake
Don't use “dein” with someone you'd address formally — switch to “Ihr” (capitalized) when speaking to a stranger or in a formal context.
Quick check
Which German word means informal “your”?
More words on this topic
Keep learning German
Practise it in a lesson →Frequently asked questions
What's the formal equivalent of “dein”?
“Ihr” (capitalized), used with formal “Sie”.
Does “dein” change its ending?
Yes — it follows the same pattern as “mein”, e.g. “dein”, “deine”, “deinen”.