it’s normally $97 but it’s on for $50.这句话里的On for怎么理解呀,

it’s normally $97 but it’s on for $50.这句话里的On for怎么理解呀, Come on,it's time_____(for) school let's try it on for size Come on,Tim!It's seven thirty.Get up!It's time for school.这句 That's what did it for the head teacher.这句话怎么理解? It's for you I just keep pushing on. It's important for him to work on their farm It's() for us() get to school on time It's time for P.E.class.Put on your ( )（括号里填“鞋子”的英文） It's too hard for me.这句话的中文? come on it's time for our English class改同义句怎么改 it’s not for you.如何理解