French language Q&A Forum

I don't understand why we can't use the 

when there is no reference to a duration of time. For example "during that year the letters had been sent"??? This sentence seems like it was a one time action. ???

To describe "Snow falls" ot just "Heavy snowfall", which verb should we use:

tomber or chuter?

What are the subtle or not-so-subtle differences between these two verbs?