Breakdown of Ils partagent de grands secrets.
grand
big / tall
ils
they (masculine/mixed)
de
of / from / any (in negative sentences) / about (concerning)
partager
to share
Questions & Answers about Ils partagent de grands secrets.
Why is it de grands secrets instead of des grands secrets?
Does de mean "of" or "from" in this sentence?
Not here! While de is a very common preposition meaning "of" or "from", in this sentence it acts purely as a plural article. It just shows that the noun is plural, similar to "some" in English. The sentence translates to "They share great secrets", not "They share of great secrets".
I thought French adjectives usually go after the noun. Why is grands placed before secrets?
You are right that most adjectives follow the noun. However, short, common adjectives describing Beauty, Age, Goodness, and Size (often remembered as the BAGS rule) go before the noun. Because grands fits into this category, it comes before secrets.
If I used a different adjective that goes after the noun, would I still use de?