The training intensified, teaching Harry and the other's basic potion making, as well as the words and wand movements (using one of Arthur's spare wands) for most of the 1st thru 4th year spells. Harry and Ron, try as they might, weren't able to master the 5th year spells yet. Arthur speculated that their magical cores weren't strong enough yet to cast the more advanced spells. The boys were relieved to think that they simply had to grow more to be able to cast the really fun spells. But, in the meantime, there were plenty of other things to learn, such as flying, and how to make Ginny and Luna squeal by pouring cold pumpkin juice down their backs. Of course, that also lead to a lesson in laundry taught by a very unhappy Molly Weasley, but, that's the way things are.