从句分析

The reason Greece's debt load is so difficult to shrink is because the economy is tanking.请问老师the reason 后面是定语从句吗，为啥没有连接词的感觉。

the reason 后面是定语从句，关系副词why被省略了。

关系副词why用于the reason后引导定语从句常可换成that或for which，且均可省略。例如：

The reason she was ill was that she had eaten bad meat. 《现代英汉词典》

The reason I called was to ask about the plans for Saturday. 《朗文当代英语词典》

The reason these cars are so expensive is that they are largely built by hand.《麦克米兰英语词典》

▲1983年版章振邦《新编英语语法》（下册）P.710有如下解释：

上述这种关系副词和关系代词交替使用的情况还表现在when和why的用法中，why在the reason why以及when在the time when结构中都能为that所取代。例如：

That is the time (that) he arrives.

That is the reason (that) he came.

但是，在这类用法中that通常省略。

曾克辉 -

擅长：英语考试 | 采纳率 54% | 回答于 1秒前

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刘永科 - 教育出版集团英语总顾问 & 英语系列图书主编 1秒前

擅长：语法理论,语言学,文化背景

reason 后面可以用why, 还可以用that，或者都不用。以下句子都正确：

The reason Greece's debt load is so difficult to shrink is because the economy is tanking.

The reason why Greece's debt load is so difficult to shrink is because the economy is tanking.

The reason that Greece's debt load is so difficult to shrink is because the economy is tanking.

表语从句，正规的表达用 that 引导，现在用 because 的情况也常见。