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

Shouldn’t it be Viens-tu      Also achètes-tu     

So in this lesson, I was studying this sentence: “Pour calmer mes enfants, je leur lis une histoire.” I also remembered that lui/leur is only used when a verb goes with “à”, like “Je téléphone à mon frère” —> “Je lui téléphone.” So is this grammatically correct? “Pour calmer mes enfants, je leur lis une histoire.” —> “Je lis une histoire à mes enfants pour leur calmer.”

Hello.
The English sentence is: I'd never seen that, it was like in a horror movie!

I must have missed the rule that explains the use of conditional past in French. Can you enlighten me please.

Thanks.