Jack ............... write when he was three, but he ............. _ ................. a picture.
Jack COULDN'T write when he was three, but he COULD DRAW a picture.
Jack .............. dance, but his friends .................
Jack COULDN'T dance, but his friends COULD
Jack's parents ............... see lots of houses, but Jack ..................
Jack's parents COULD see lots of houses, but Jack COULDN'T.