Why hasn't John told the court what he knows in act 2 ?

Elizabeth reminds him of this. That the girls were just playing around in the woods and no witchcraft was involved. Why hasn't John Proctor told the court what he knows?  John worries how he would prove what Abigail said (since they were alone).

hope this helps :)

as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.