French language Q&A Forum

What does "en train de" literally mean?

The following -ETER and -ELER verbs behave differently: they always and ONLY take the accent è on the first -e (-eter/-eler):

-ELER: agneler - celer - receler - ciseler - démanteler - écarteler - s'encasteler - geler (and derivatives: dégeler, congeler, surgeler) - marteler - modeler - peler

-ETER: acheter (and derivatives:racheter) - bégueter - corseter - crocheter - fileter - fureter - haleter

se laver; se lever; se réveiller; s'amuser etc.

these words doesn't have anything special, do they?

Why not put them in the same lesson?

Tu feras tes devoirs pendant que je ferai la vaisselle.

vs 

Pendant que tu feras tes devors, je ferai la vaiselle.

Are both of them the same? (that I could use it either at the beginning of the sentence or in the middle to join the two sentences.)

Does the same rule also apply to some other words like "alors que" "tandis que" ?

Merci d'avance pour les réponses !

I cannot find specifically in Progress/KwizIQ section a lesson or description of compound tenses but to date all the examples I have seen use Passé Composé, or a couple of examples of Pluperfect as in this lesson. There is an extended review of compound tenses on the Lawless site itself. It would be useful to link to information on all the compound tenses/moods here. Alternatively, at least, include in this and any other compound tense related lessons, a line or two confirming (or otherwise) that the rule discussed is general to all compound tenses and moods. 

Is it possible to say: "Mme Lupin est la professeur." ??

Which is better to use:

Vous avez un chat?

OR

Est-ce que vous avez un chat?

Why prefer one over the other?

I have seen other French learning apps that ask questions by saying: Où est-ce que vous allez?

Which is correct: "Où vous allez?" OR "Où est-ce que vous allez?"? 

If both are correct, when is one used over the other?