检验师考试试历年试题:it's too hot today. but we could go swimming 里面的COULD为什么是过去式啊？？是什么原因撒

It's too hot.Would you mind ____the door?---____.Please do it now it's too hot today. but we could go swimming 里面的COULD为什么是过去式啊？？是什么原因撒 It's also fun too. It's too hard to me. it"s too hard It's too hard.Why____the farmer for help. It's never too old to learn.怎么解释？ It's a little hot for me,--------? It's too late to go to the football match now ,____(何况),it's beginning to snow 请教It's way too high.中way的用法解释～～～～