几个英语问题1,Firemen had been fighting the forest fire for nearly

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/06/16 10:57:45

几个英语问题
1,Firemen had been fighting the forest fire for nearly three weeks before they could get it under control .中的could起到什么作用
2,by then ,however,in many places the green had begun already taken root.中的however意思和作用
3,音标中的ou是什么,为什么在音标表中找不到,字典里却出现

could 情态动词,这里情态动词用来加深语境
however 没什么特别,作然而,可是解,很常用的副词,用于上下句意思上的过渡
ou 和əu发音一样,你看看你字典是否这两种音标都出现,如果不是的话,就是印刷的问题.

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