Question

求大神划分句子结构

when a plane from london arrived at sydney airport,workers began to unload anumber of wooden boxes which contained clothing 求大神划分句子结构

Answer 1

When a plane 到airport是不用看的，要看main clause，也就是後半句。
workers 是主语，began to unload是谓语，a number of wooden boxes 是宾语，其中 a number of 是限定词。which後面的是relative clause（休息boxes），也是不用看的。