French language Q&A Forum

I am having a difficult time deciding when devoir is appropriate and when it is not.  All the other applications, I am ok with.  But if devoir implies "must have" why is a purse a necessity? Why not just Avoir besoin?  And why is sleep NOT a necessity (or I may be getting this confused at this point). This is getting to be more of a guessing/memorization thing than an actual understanding thing.  I see from the previous posts that this has been discussed ad infinitum so it's not just me.  Any easy way to decide when to use devoir and when NOT to use it in this context?

Thanks

I see that some verbs that take de or à and the infinitive drop the preposition when an object follows the verb.  As an example, choisir de drops the preposition when referring to an object as follows:

Je choisis de partir

Je choisis la cérise

As opposed to rêver that keeps its preposition in both cases:

Je rêve de partir

Je rêve du paradis

Is there a rule for this?

"on aurait dit un savage" translates to it looked like a savage, but I'm unsure of the rule for that. Is there a lesson on this? 

In the quiz it gave this translation of the English : 'Ils n'ont plus de vin" but I would have translated this as 'they don't have any more wine', which is quite different in meaning in English. Would my version be incorrect? If so how would I say that in French? Merci!

I'm not sure where to ask this, as the fill-ins do not have a comment section. But I recently completed the test and was marked incorrect for an answer of:

>

The correction provided was:

>

Can someone explain why this is the case? Why the "on" form for "nous"? Thanks!