

Ich habe keinen Zweifel an deinem Erfolg.
[ˈɪç ˈhaːbə ˈkaɪ̯nən ˈtsvaɪ̯fl̩ ˈan ˈdaɪ̯nəm ɛɐ̯ˈfɔlk.]
I have no doubt about your success.
Hast du Zweifel an dem neuen Projekt?
[ˈhast ˈduː ˈtsvaɪ̯fl̩ ˈan ˈdeːm ˈnɔɪ̯ən proˈjɛkt?]
Do you have doubts about the new project?
Ohne Zweifel ist das unser bester Kunde.
[ˈoːnə ˈtsvaɪ̯fl̩ ˈɪst das ˈʊnzɐ ˈbɛstɐ ˈkʊndə.]
Without a doubt, that's our best customer.
"die Zweifel" is in the lesson "Business 2" (Level 38), along with 11 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.