They _____ so tired if they _____ for a whole day .wouldn't be feeling ; hadn't been walking很明显考的是if 在非真实条件句中的用法 但是那到底是表示对过去还是现在的假设呢.我应该怎样去区分这样的句子呢

The girl stopped _____(climb)up the hill.She was so tired.It's a pity that they failed _____(pass)the exam tired,so So tired~ They were so tired that they _______ soon after they arrived home. They are too tired to exerciseThey don't exercise because they _____ _____ _____ _____.使两个句子意思一致 反意疑问句:①He is so tired that he can't work,_____ _____?快, they were so tired that they couldn't walk any more (同义句转换） They feel tired,so they stop ( ) a restA.havingB.to haveC.haveD.has _____ they were very tired,they fell asleep at once.没有选项 They are too tired to walk farther.(改为同义句They are so tired that they can not walk farther.为什么用can‘t so tired for moving Catch cold so tired “So tired of feeling So tired Please waiting Ted _____ （seem） so tired today ,what's wrong with him?用适当形式填空 im tired _____ happy today.A because B but C or D so 改错the students were very tired after school ,so they felt happy 改错the students were very tired after school ,so they felt happy