They aren't goying to swim_(肯定句they are going to swim_否定句They aren't going to swim_一般疑问句are they going to swim?)
The girls aren't interestde in dawing.(肯定句The girls are interested in dawing.(,否定句The girls aren't interested in dawing,一般疑问句are girls interested in dawing?
I'd like to buy a ruler.(肯定句I'd like to buy a ruler,否定句I'd not like to buy a ruler,一般疑问句would you like to buy a ruler?
my father can't sing the song.(肯定句my father can sing the song,否定句my father can't sing the song,一般疑问句my can your father sing the song?