Using prepositions in French can be quite tricky for advanced learners. Here are some key challenges they face:

1. Complex Use:
   French prepositions don’t always translate directly into English. For example, the word "à" can mean "to," "at," or "in," depending on how it’s used. This can be confusing and lead to misunderstandings.

2. Complicated Phrases:
   In more advanced situations, prepositional phrases get more complex. Phrases like "en faveur de" (in favor of) or "en dépit de" (despite) need a deeper understanding to use correctly.

3. Idioms:
   Many prepositions show up in idiomatic expressions that don’t make sense if you translate them directly. This can confuse learners who try to understand everything word for word.

Even with these challenges, advanced learners can get better at using prepositions by:

• Regular Practice: Doing exercises that focus on how to use prepositions correctly.
• Listening to Native Speakers: Watching shows or listening to songs to hear how native speakers use prepositions.
• Learning in Context: Understanding how phrases are used in different situations to grasp their meanings better.

Overcoming these challenges takes dedication, but with consistent effort, learners can show steady improvement!