In the first example -
‘On fait ce que l’on peut’ the -l is added because otherwise you would say -
‘...que on peut‘ and ‘que on’ doesn’t only clash but can sound like the rude word ‘con’ in French .
In your second example -
‘Mange -t-on du riz?
the -t is necessary as otherwise it would sound like ‘Mange on ....’ which would sound like a command, Mangeons! ( Let’s eat!)
So, often these two letters are added to make the language flow more freely and to avoid ambiguity.
Hope this helps!
My question was mainly about when do I use L and when I should use T. Is there a rule or can I use them interchangeably?
The -t is used mainly with inversion subject and verb when the verb ends in a vowel and the pronoun starts with one , so mainly for regular verbs with ER endings but some others too -
Achète- t- il du beurre?
A-t-elle des chances de réussir?
The -l is only with 'on' I believe, can't think of another instance where you might use it...
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