French language Q&A Forum

I am confused by 

Tu auras dû renoncer à ton rêve.

How to express decimal numbers (e.g. 0.8, 9.876...)?

Is this correct?: zero point huit

Thank you

Does Ne ... pas + Passé composé + depuis longtemps =

a)Tu ne fumes pas depuis longtemps. 

b)Tu n'as pas fumé depuis longtemps

c) Tu ne fumes plus depuis longtemps

And am not getting this at all... 

"deux plus deux égal quatre".. you say the égal is an adjective... the égal must somehow be "working" on the two numbers like a verb and I am not seeing how an adjective can work in this position?

I grew up using "font" although happy to use égale.

I don't understand why we use "année" instead of "an", it seems to me that according to the lesson below, we should be using "an".

An vs année, matin vs matinée, jour vs journée, soir vs soirée to express a time unit or a duration in French

Your website continues not to work. Once I make a written response, it will not show me what I have wrong or correct and it will not score my attempts correctly

Hi

There are three phrases which the lesson translates into the same expression “What is a pen?”

Qu’est-ce que / Qu’est-ce qu’un stylo ?

Qu’est-ce que c’est / Qu’est-ce que c’est un stylo ?

Qu’est-ce que c’est que / Qu’est-ce que c’est qu’un stylo ?

What is the difference between the 3 questions?   When should each one be used?

Thanks

Would it possible to prompt the users that they haven't answered all the questions.