如何分辨一个名词后的to do短语作的是定语还是状语？ 怎么区分作定语和作状语？请看一下两句，求高手帮忙点拨一二。。...
I have something to do.\u8fd9\u91cc to do \u662f\u5b9a\u8bed\u5462\uff0c\u8fd8\u662f\u72b6\u8bed\u5462\uff1f\u600e\u4e48\u533a\u5206,,,I have something to do.\u6211\u6709\u4e9b\u4e8b\u60c5\u8981\u505a\u3002
\u8fd9\u91cc to do \u662f\u5b9a\u8bed\uff0c\u56e0\u4e3a\u5b83\u662f\u4fee\u9970something\u8fd9\u4e2a\u4e0d\u5b9a\u4ee3\u8bcd\u7684\u3002\u51e1\u662f\u4fee\u9970\u540d\u8bcd\u6216\u4ee3\u8bcd\u7684\u90fd\u662f\u5b9a\u8bed\u3002\u53c8\u5982\uff1a
I have an important lecture to attend.\u6211\u6709\u4e2a\u91cd\u8981\u7684\u6f14\u8bb2\u8981\u53c2\u52a0\u3002\u5373\uff1a\u6211\u8981\u53c2\u52a0\u4e00\u4e2a\u91cd\u8981\u7684\u6f14\u8bb2\u3002
\u72b6\u8bed\u662f\u4fee\u9970\u52a8\u8bcd\u7684\u3002\u6709\u65f6\u95f4\u72b6\u8bed\u3001\u5730\u70b9\u72b6\u8bed\u3001\u539f\u56e0\u72b6\u8bed\u3001\u65b9\u5f0f\u72b6\u8bed\u3001\u6bd4\u8f83\u72b6\u8bed\u3001\u4f34\u968f\u72b6\u8bed\u3001\u8ba9\u6b65\u72b6\u8bed\u7b49\u7c7b\u522b\u3002
\u7279\u522b\u6ce8\u610f\uff1aI have something to do.\u4e2d\u7684to do\u4e0d\u662f\u5bbe\u8865\u3002have sb. /sth. to do sth. \u624d\u662f\u52a8\u8bcd+\u5bbe\u8bed+\u5bbe\u8865\uff0c\u5b83\u7684\u610f\u601d\u662f\u8ba9\u67d0\u4eba/\u67d0\u7269\u505a\u67d0\u4e8b\u3002\u5bbe\u8bed\u4e0e\u5bbe\u8865\u4e4b\u95f4\u4e00\u5b9a\u6709\u903b\u8f91\u4e0a\u7684\u4e3b\u8c13\u5173\u7cfb\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0cto do\u524d\u9762\u7684\u90a3\u4e2a\u540d\u8bcd\u662fto do\u8fd9\u4e2a\u52a8\u4f5c\u7684\u53d1\u51fa\u8005\u3002\u4f46I have something to do.\u4e2d\u7684sth. \u662fto do\u8fd9\u4e2a\u52a8\u4f5c\u7684\u5bf9\u8c61\uff0c\u662f\u5b83\u7684\u903b\u8f91\u5bbe\u8bed\u3002
\u795d\u4f60\u5b66\u4e60\u8fdb\u6b65\uff0c\u66f4\u4e0a\u4e00\u5c42\u697c\uff01 (*^__^*)
\u4e0d\u660e\u767d\u7684\u518d\u95ee\u54df\uff01\u8bf7\u8bb0\u5f97\u91c7\u7eb3\uff0c\u591a\u8c22\uff01
\u7b80\u5355\u8bf4\uff0c\u5b9a\u8bed\u4fee\u9970\u540d\u8bcd\uff0c\u72b6\u8bed\u4fee\u9970\u52a8\u8bcd
这里的to abide by the state 's strict nuclear regulations作定语修饰限定commitment。当它宣布出来时，它正在违背遵守国家严格核法规的长期承诺。
判断to do短语作定语还是状语需要看一下句意，因为to do短语可以作定语也可以作状语。
不定式作状语时，作用相当于副词。可以表示原因，目的，结果。
比如表原因，常放在形容词后面
I’m sorry to hear that.
表目的:
I spent half year’s savings to see you.
表结果：常与only，never连用。
I hurried to get there only to find him out.
不定式作定语时，往往与他修饰的名词或代词形成逻辑上的动宾或主谓关系。
比如 The next train to arrive was from Lanzhou. to arrive 和 train形成主谓关系。
When it announced， it was reneging on a longstanding commitment to abide by the state 's strict nuclear regulations.
此句中commitment 和 to abide by …形成主谓关系。
另外，除了此句话，可以看一下上下文帮助判断句子意思。
When it announced it was reneging on a longstanding commitment to abide by the state 's strict nuclear regulations.（当它宣布出来时，它正在违背“长期遵守国家严格核法规”的承诺。）to do短语若是状语，必须修饰包括谓语动词在内的部分，若修饰都不合逻辑，所以它不是状语，只能是longstanding commitment的后置修饰语。
对，这个是状语。一般做表语的名词后的不定式是定语。修饰名或代的是定语，修饰谓语动词，和修饰整个句子的是状语。
扩展阅读：哪些名词后面加to do ... 形容词后to do 成分 ... 名词后加to do大全 ... 哪些名词加to do做定语 ... 序数词后面用to do ... 常用todo作定语的名词 ... 那些名词后接to 口诀 ... the十名词十介词to ... 目的状语to do ...
