e>é+syllabe muette, l>ll+syllabe muette, y>i+syllabe muette

e>é+syllabe muette, l>ll+syllabe muette, y>i+syllabe muette

Rules with proper grammar and terminology:

"e" becomes "é" before a silent syllable: This rule refers to the transformation of the letter "e" to an accented "é" when it is followed by a silent syllable. For example:

"le" becomes "l'école"

"de" becomes "déjà"

"ce" becomes "c'était"

"l" becomes "ll" before a silent syllable: This rule indicates the doubling of the letter "l" when it is followed by a silent syllable. For example:

"le" becomes "l'illustration"

"il" becomes "l'illusion"

"mal" becomes "m'allier"

"y" becomes "i" before a silent syllable: This rule denotes the change of the letter "y" to "i" when it is followed by a silent syllable. For example:

"il y a" becomes "il i a"

"ils y vont" becomes "ils i vont"

"déployer" becomes "dépliayer"

Syllabe muette

In the phrase "syllabe muette," "syllabe" means "syllable" and "muette" means "silent." 

So "syllabe muette" refers to a silent syllable. 

In the context of the rules provided, it refers to a syllable that is not pronounced in speech. 

For example, in the word "table," the final "e" is a silent syllable.