0 used to show the place where someone or something starts: --
1 used to show the time when something starts or the time when it was made or first existed: --
3 used to show the origin of something or someone: --
4 used to show the material of which something is made: --
5 used to show the level at which a range of things begins, such as numbers or prices: --
It was a little secret that I kept from him all those years.
It's preventing us from making progress.
Vitamins are supposed to boost your immunity from infections.