Boy2: Mama, what does pitch in mean?
Me: It means to help, to contribute.
Boy1: What does contribute mean?
Me: To give time or energy or money or effort towards something. So, who wants chocolate sorbet and who wants clementine and honey sorbet?
Boys1&2: Both, a lot of chocolate and a little clementine.
Boy2: Mama, what does so mean?
Boy1: It means donc.
Boy2: I didn't ask how to say it in French, I asked what it means. And anyway, you stay out of it.
Me: So is a conjuntion among other things, it means different things depending on how we use it.
Boy1: What's a conjuction?
Me: Don't talk with your mouth full of sorbet.