is23lame

[bitter stream]

Please be patient

Our volunteers look into many questions every day; sometimes it takes them a little while to answer.

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[slow cloud]

The use of "** l'** " facilitates pronunciation, but it's not mandatory.

[long abyss]

L'on is also more formal.

[lean oasis]

so it is an expletive?

like it can be omitted without changing the meaning or anything?

[sudden hatch]

It's because "on" comes from "l'homme"
The l' can be retained in more formal situations, particularly between vowels, but is never mandatory

[lean oasis]

merci beaucoup!

[empty prawn]

L' is just added for pronunciation or to make it more formal.
One more thing is that qu'on may sound like « con »

[sudden hatch]

It doesn't, no one interprets it that way

And it's always formal if used, it's never "only" for pronunciation

It's just retained easier between vowels