1.c.cost
b.looking for ,find
I spend $50 on this chair.(同义句)
I paid- $50 for- this chair.
He play the computer games after supper.(改为现在进行)
He is playing the computer games now.
The boy has no money on him.(同义句)
The boy doesn't have money on him..
My ruler is different from yours.(同义句)
I don't have the same ruler -as- yours.