The reason why he didn’t attend the meeting is that he was ill中,引导词why可以省略,
第二句,Very few of the 50 pence pieces and pound coins I have given him have found their way there,
I have given him 前面的关系代词that由于在定语从句中作given的直接宾语,省略了.
第一句why 是关系副词,只有在先行词reason之后可以省略
第二句省略的that 是关系代词,在定语从句作宾语时可以省略
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