"The doctor has a boy and a girl."
Translation:לרופא יש בן ובת.
I can't complain exactly, because I was told today that I had a typo for the literal translation, rather than being marked wrong. I took it to mean these are the doctor's children.
However, if Duo wants us to answer "בן ובת", the sentence should read "son and daughter" instead of "boy and girl." These phrases are no more, or less, interchangeable in Hebrew than in English (they are, to some extent, but IMHO it's still better to get it clear which is which, first.).
No; the forum and further research/learning are supposed to help you with this. ;) The Tips and Notes and the exercises are not only a mean to an end, not the alpha and omega of language acquisition. I do not blame the course conceptors, you cannot teach something as massive as a full language in only a few short tens of units.
This is the not so good part about DL that it quizzes you with the content which has not been taught. I assume they want us to learn in this way, but it could be frustrating since you have to guess. It'd be better if the new content is in the question rather than in the choices.
Note that I didn't say הרופא doesn't mean anything. It does mean "the doctor". But you can't combine it with the particle יש which is essential when talking about possession.
So, יש on its own means "there is", but when you combine it with the preposition ל it becomes a phrase that talks about possession. יש לי ספר - I have a book. (literally "there is to me a book").
Similarly you can say הרופא אוכל to mean "the doctor is eating". But if you want to say that the doctor has something, you have to say it לרופא יש. Another example could be: לרופא יש בית גדול. "The doctor has a big house". (literally: "to the doctor there is a big house").
Another important note. לרופא יש, when written can mean both "a doctor has" and "the doctor has". The difference can be seen when writing nikud or when pronounced. "le-rof'e yesh" is "a doctor has" and "la-rof'e yesh" is "the doctor has".
One final note. By your question, I am guessing you are not aware there are tips and notes on the website, explaining grammar. They are located in the introduxtion to each skill. I recommend you to check those out, especially the one feom the skill "There is" which explains how the verb "to have" works in Hebrew.
What would it mean if someone said this sentence except with the words for boy and girl that we saw early in the course, what would it mean ("לרופא יש ילד וילדה")? Which of these interpretations would people come to: a. The doctor has two patients b. The doctor literally owns these two, either there's a slavery situation or two animals. c. This really isn't a sensible Hebrew sentence. d. Other