French language Q&A Forum

Hello, I can’t find any lessons about “ce dont” on kwiziq though I’ve seen it being used by french people many times. So I look it up on lawless french and find a comparison between “ce dont” and “dont” (https://www.lawlessfrench.com/grammar/indefinite-relative-pronouns-ce-dont-quoi/) and I still can’t tell the difference between the two. Please help. Thank you so much!

In this example, I am wondering why soudainement is not used (adding "ment" to the feminine version of an adjective).

I am looking at this sentence and soudain seems to be used as an adverb/is that why no "ment".  If so would you please provide me with an example where soudainement might be used?  Many thanks. 

On regardait les lucioles, et soudain toutes ont disparu.

Usually "cet" goes before a noun that begins with a vowel.

But in this lesson we have "cette année" and "cette epoque."

Evidently, these are exceptions.  Is there an explanation for this?  Are there other exceptions?

Thank you for your help.