分析英文长句动词时态So it was with considerable symbolism that President Obama arrived on Wednesday in Canberra,Australia’s capital,for a trip that will include an announcement that the United States plans to use Darwin as a new center of

分析英文长句动词时态So it was with considerable symbolism that President Obama arrived on Wednesday in Canberra,Australia’s capital,for a trip that will include an announcement that the United States plans to use Darwin as a new center of
分析英文长句动词时态
So it was with considerable symbolism that President Obama arrived on Wednesday in Canberra,Australia’s capital,for a trip that will include an announcement that the United States plans to use Darwin as a new center of operations in Asia as it seeks to reassert itself in the region and grapple with China’s rise.
长句时态方面学得不是很好,能分析一下为什么要用：it was,arrived,will include,plan to use,as it seeks to
能点明语法点最好,越详细越好,

分析英文长句动词时态So it was with considerable symbolism that President Obama arrived on Wednesday in Canberra,Australia’s capital,for a trip that will include an announcement that the United States plans to use Darwin as a new center of
首先,为了理解起来更容易些,我们把这个句子分解成下面几个分句：
（1） it was with considerable symbolism that President Obama arrived on Wednesday in Canberra,Australia’s capital,for a trip
（2） (for a trip) that will include an announcement
（3） (announcement) that the United States plans to use Darwin as a new center of operations in Asia
（4） as it seeks to reassert itself in the region and grapple with China’s rise
分析：
（1）So是承接前句讲下来的,表示（前）因（后）果关系.it was ...that是强调句,故前后时态一致：一般过去时.本句可还原为：President Obama arrived with considerable symbolism on Wednesday in Canberra,Australia’s capital,for a trip
（2）that引导的是一个定语从句,而不是前面网友解释的for引导原因状语从句.这里用will include的原因是后面的announcement尚未发表；
（3）announcement后面的that引导的是一个同位语从句,是对announcement内容的具体说明；此句中用一般现在时plans,表示计划、安排或打算等；
（4）Asia 后面的as引导的是一个原因状语从句,语气较弱.这句话里的时态用一般现在时的原因与前面（3）的原因相同.
前面网友建议,学语法不要拘泥于语法条款是正确的,但如果一个句子的来龙去脉都没有搞清楚,是很难提高英语口语和写作的准确度的.简言之,学语法是为了运用而不是为了做题.

楼上说的很对，很支持，从个人经验来看，时态并不是唯一，要找最佳，总的看，结束的瞬间完成的一般过去式比较好，结束了但有可能延续就用完成时态，即将的，或不怎么发生变化的动作用一般现在。

So it was with considerable symbolism that President Obama arrived on Wednesday in Canberra, Australia’s capital,强调句型，强调obama总统来到堪培拉这件事是具有象征意义的，因为obama来了是以前的事，所以是过去式。for a trip that will include an an...

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So it was with considerable symbolism that President Obama arrived on Wednesday in Canberra, Australia’s capital,强调句型，强调obama总统来到堪培拉这件事是具有象征意义的，因为obama来了是以前的事，所以是过去式。for a trip that will include an announcement that the United States plans to use Darwin as a new center of operations in Asia as it seeks to reassert itself in the region and grapple with China’s rise.for引导原因状语从句，由于未来要发表一个声明，所以要用未来时，第二个as后面引导也是原因状语。
学英语别纠结那么多时态语法问题，会越学越没劲。多看英文资料，培养语感最重要。

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