French language Q&A Forum

I was taught that, in addition to "Elle croit que c'est une mauvaise blague," "She (thinks it/ believes it to be) a bad joke" can also be written "Elle croit à une mauvaise blague." A visit to context.reverso seems to bear this out, whereas this lesson says that "que" is always required. Is this lesson perhaps missing a note of exception, or am I misinformed? 

Can I assume this can also be used for its literal translation? EX: "When are we going to all get together?" "I don't know. When we open the presents?"

Writing as someone whose education didn’t include instruction in all the tenses - or, more truthfully, I just wasn’t paying attention - I’d like to know when to use subjunctive present instead of plain ordinary present. I suppose I could just Google it but I’d rather find it in Kwiziq. This is more an observation than a question. Thanks for your time.

Would either be accepted? It's my understanding that one means "at the end", and the other means "finally". Thank you

Is it acceptable to say here instead:

Sur laquelle elle s'allongeait en rêvassant pendant des heures.?

Ex- "Je n'aime pas les foules et je déteste danser" from "
I don't like crowds and I hate dancing"
I came up with "Je deteste les foules et je hate danser"

Some vernacular examples would help.