Arlo hits these days, usually me or DH when he's not getting his way. I usually just say no we don't hit, but often that just gets a laugh. Or I'll say, no be gentle with mummy, and he starts stroking my face instead of hitting. I've seen him do it once or twice with other children, when they take something away from him, and I struggle more with what to do in that situation.
Arlo is really good at repeating back words too, although with longer ones he often gets the syllables mixed up which is quite sweet. Thomas (the tank engine) is Motas. And his childminder, who is Lily, he calls Ninny!! His words have been coming so quickly recently, you realise how much they understand, so he says 'big' when there's a big bubble or something, and 'man' when the builder comes to the door, he knows up and down, and can do numbers too, if you say can you count how many whatevers, he says 'two', and if you continue up to ten, he often knows which number comes next. His favourite activity is vacuuming, he says 'woowah' (hoover!), and does the actions, several times a day, to indicate he'd like to hoover now!