Hi Judy,
Just to add to Chris’ excellent answer, this is the Kwiziq lesson referring to the use of the ‘ne explétif’ used with the expression ‘avant que’ -
https://french.kwiziq.com/revision/grammar/how-to-use-avant-que-ne-expletif-subjonctif-before-i-do
Hope this helps!
The "ne" is not a negation, it is a stylistic element called the "ne explétif". There are certain verbs and phrases with which it needs to be used, some it may be used and others it shouldn't be used at all. There are lessons for this on kwiziq at a later stage.
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