Why the verb is used in Conditional?

Question

Thanks so much for the great lesson. However, I am now really confused about why the sentence "You wouldn't think she is 90'' is translated into ' On ne lui donnerait pas 90 ans''? Why is the verb in Conditional? Thank you so much.

Answer

Bonjour Gerbera !

Here, the French sentence literally reads as "You wouldn't give her 90 years.", which echoes the notion of doubt contained in "You *wouldn't* think she is 90.".
Both sentences are in the conditional here, to express uncertainty.

I hope that's helpful!
À bientôt !

Answer

Aurelie, many thanks, your explanation is clear.
But I don't understand why the other example used isn't also in the conditional i.e.  " people shouldn't speak with their mouths full" : " on ne doit pas parler la bouche pleine".  Why isn't the English translation "people mustn't eat with their mouths full"?

Answer

Bonjour Nigel !

You are absolutely right on this one :)
I've now edited the English to match the French, thanks to you.

Merci et à bientôt !