French language Q&A Forum

What is the difference between article definis and article indefinis. Why can't we use les or des for a plural, or any of these?

please tell any site that has a list of suggested vocabulary for delf a1

Bonjour Madame !

A sentence stated in the lesson reads - 

“Elles se seront réveillées trop tard et auront manqué leur train.”

Could this sentence have a better meaning if one writes as -

“Elles se seront réveillées trop tard et manqueront leur train.”

This would indicate that the action of waking up will get completed first, followed by that of missing the train.

As the grammar tip in one of the lessons at Kwiziq  states- 

Le Futur Antérieur-> Action which will finish first.

Le Futur Simple -> Action which will happen once the former action gets completed in the future.

Would 'pendant que' be correct here? What are the rules regarding which of the above (Alors que v pendant que v tandis que) to use?

im getting these muddled all the time. is there an easy way to tell the difference please