

Ich möchte gern eurem Sportverein beitreten.
[ˈɪç ˈmœçtə ˈɡɛrn ˈɔɪ̯rəm ˈʃpɔrtfɛɐ̯ˌʔaɪ̯n ˈbaɪ̯tʁeːtn̩.]
I'd like to join your sports club.
Letztes Jahr ist sie der Gewerkschaft beigetreten.
[ˈlɛtstəs ˈjaːɐ̯ ˈɪst ˈziː deːɐ ɡəˈvɛrkʃaft ˈbaɪ̯ɡətreːtn̩.]
Last year she joined the union.
Hast du Lust, unserem Chor beizutreten?
[ˈhast ˈduː ˈlʊst, ˈʊnzərəm ˈkoːɐ̯ ˈbaɪ̯ˌtsuːtreːtn̩?]
Would you like to join our choir?
"beitreten" is in the lesson "Verbs 20" (Level 43), along with 10 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.