。。。is a phenonmenon in which changes in the ocean and atmosphere combine to allow the warm water that has accumulated in the western Pacific to flow back to the east.

combine to 在这里是修饰什么的？哪位NN能分析下句子结构，谢谢

...is a phenomenon in which changes in the ocean and atmosphere combine to allow the warm water that has accumulated in the western Pacific to flow back to the east...

深色部分in which...为定语从句，其中changes为主语，combine是谓语动词， to allow...表目的的状语从句修饰combine； that has accumulated in the western Pacific 定语从句修饰the warm water, to flow...作为宾补出现， allow sth to do.

changes 主语 ，combine 谓语

变化 纠缠在一起，导致能够允许。。。

这里 combine 和 to 不是一个词组了，应该分开，combine 是前面从句中的内容，相当于 changes in the ocean and atmosphere combine in the phenonmenon ；而 to 是从句带的目的状语。

这样看这个句子：

。。。is a phenonmenon in which changes in the ocean and atmosphere combine to allow the warm water that has accumulated in the western Pacific to flow back to the east.

语法上没有问题，但是说两个自然现象为了......而结合，感觉非常别扭。自然现象

怎么会有意识地做什么呢？欧觉得这里用allowing表示现在分词作结果状语非常合适。但

og11特别说明：A better choice would be to follow combine with a to allow,

showing purpose.感觉郁闷.

那位给解释解释......