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It would be really great if this VERY important concept of Direct Object could be added to this lesson. - https://kwiziq.learnfrenchwithalexa.com/questions/view/wrong-answer-nous-sommes-brosse . 

More importantly because, this lesson says this « Note that when être is used as the auxiliary in compound tenses such as Le Passé Composé, the past participle must always agree in gender and number with the subject of the verb.»  --- and this statement is not true for this lesson on reflexive verbs as per the link. It creates a confusion. Kindly rectify this incorrect statement and help us new learners with the necessary concept within this lesson, please!

Thank You.

Leave my sister alone! 

Would Laissez-la! Carry a greater sense of gravity than Laisse-la! ?  

What is the negative form of nous(manger)?

Why do you use “à la” with New-Orleans (On va à la Nouvelle-Orléans la semaine prochaine) if there is no article in the name of Nouvelle-Orléans? Is it because it’s a feminine noun? Do I have to use “à la” and “de la” with all feminine nouns OR only with the ones that start with the feminine articles?

I don't understand why déchiffrer is in the "vous" form here. Surely after "arrivez à" it should be in the infinitive ? Or does "Arriver à" behave differently from most verbs with à after them ?

This sentence has a question mark, but it got marked as wrong. In the text above, the sentence ends with a period. 

the dog owners who don't pick up their excrement?

Recently I got the question "C'est une ________ maison avec un beau jardin." which translates to:  This is a beautiful house with a beautiful garden. However, if this is truly translated it is C'est une belle maison avec un beau jardin. Please fix