French language Q&A Forum

Sometimes I really struggle with deciding whether to use imparfait or passé composé. In this example, the English phrase is:

"I've always dreamed of going (there),

For me, I translated this to "Je rêvais toujours d'y aller," as it is something in the past, but not a fixed point with a clear start and stop. It is something that occurred over a period of time and is still occurring. However, the correct answer was passé composé with "J'ai toujours rêvé d'y aller,"

Can you please explain to my why passé composé is used here and not imparfait? I'm very frustrated and feel like this is something I'm never going to get.

For this question, is it okay to use": "Il te faut son lit". I understand that il faut can be used in a general sense and also to give instructions to a specific person. So my answer should be correct right? The correct answer is": Il faut son lit. I want to know if both are correct or not. Appreciate any further insights. Merci :)

________ son lit.You must make your bed.

I don`t understand why  this sentence ("She hid until he left." ?after)  could not be the second sentence below just as much as it could be the first one....  

Why in the phrase "J'ai plus de livres que toi" the letter S is readable, and in the phrase "Tom a plus de cent euros dans son porte-feuille !" - not?