If I say Je vous deteste tous-I hate all of you. Then,tous is a pronoun but not a complement to the subject. So do you pronounce the S?
If 'tous' is a pronoun (being a subject of a verb or a complement of an existing plural subject), then the -s is pronounced. If 'tous' is an adjective, then the -s is not pronounced.
See links to two previous answers on this topic:
TOO, silent S - 'tous' pronounced as 'toos'
I hope this is helpful.
Bonne journée !
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