phrasal verbs are amongst the hardest parts of English grammar to grasp. I remember one friend (a French native) marvelling at the fact that even small children seem to be able to get the hang of them when non-natives spend a lifetime trying to master them. (You know who you are!)
On this note Amaia amused me today by taking things to a new level. Not content with her usual 'Léon stop winding me up!' she decided to invent her own with 'Léon, is that you annoying me up again?' I think I'll start using that one - it's very expressive, and so sweet!