French · Pronunciation Guide
luh SAK — an open "ah" and a fully pronounced final "c".
The phrase peaks on SAC, one syllable closed firmly by the "k". The word covers bags of all kinds — handbag, backpack, shopping bag — so it is far more general than English "sack".
Listen: le sac
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J'ai oublié mon sac.
I forgot my bag.
Listen: J'ai oublié mon sac.
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"J'ai oublié mon sac" uses the passé composé, with "j'ai" elided and running straight into the vowel of "oublié". "Oublié" ends in a closed "ay" and has the back "oo" at the front: oo-blee-AY. "Mon sac" makes no liaison since "sac" begins with a consonant.
The vowel gets flattened toward the English "a" of "cat", producing "sack". French wants an open, back "ah". Learners who have absorbed the silent-final-consonant rule also sometimes drop the "c" — but it is always pronounced here. And the meaning is broader than English "sack", so it is the everyday word for any bag.