"这是他以前的女朋友。"

Translation: This is his previous girlfriend.

[hippietrail]

This should also accept 'This is his old girlfriend'

[NasuSamaruk0]

Yes, it is also possible to say "This is his previous girlfriend".

[Alan946894]

2020.11.5
Generally, people say ex-girlfriend regardless of what 以前 literally means

[PeaceJoyPancakes]

I like "former" better. This may be merely a personal preference, but to me "previous" contains a strong suggestion, if not an definitive indication, that he has a new one, whereas "former" seems more agnostic on that question (and therefore a better match for "以前的").

("Erstwhile" is even clearer, but much less common these days. "Old" is clear too, and common, and I have nothing against it. "Prior" is a possibility but significantly less common than "former".)

[hippietrail]

Yes that's what I entered this time and came to check if anyone else was suggesting it yet (-:

[JeroenSavelkoels]

I read coogar when you say old girlfriend. Not ex-girlfriend and that is what they mean.

[DaveinNYC]

Or "This is his prior girlfriend".

[CalvinC.3]

For the listening exercise - "this is her previous girlfriend" should be accepted as well. :D

[PeaceJoyPancakes]

Are there listening (type-what-you-hear) exercises in the Chinese course? I don't think I've encountered any yet, but if there are, I assume you mean that "她" should be accepted, which is certainly true.

[CalvinC.3]

Yes that is what I mean. There are no "type-what-you-hear" exercises by default, only the word bank ones, but I set them to type what you hear for extra practice.

[lamprecht98]

You may also say 这是他前女友。i feel that this is literally most accurate.
The given answer sounds like " this is his girlfriend in the past"

[Kevin92437]

This would be a very awkward introduction to someone

[George792719]

Please Duolingo, surely 'former' rather than 'previous'.