I don't want to wait until then to buy sunglasses.
此处wait until then to buy sunglasses是什么结构呢?
I don't want to wait until then to buy sunglasses.
参考译文:我不想等到那个时才买太阳镜。
解答:to wait until then to buy sunglasses为不定式作谓语动词“don't want”的宾语成分
备注(1):until then为介词短语作不定式to wait的时间状语。
备注(2):to buy sunglasses为不定式作不定式to wait的目的状语。
【A】以上整个句子语法结构如下
I 【主语】//don't want【谓语动词】// to wait until then to buy sunglasses【宾语】.
【B】不定式语法结构分析如下
to wait 【不定式】//until then【时间状语】// to buy sunglasses【目的状语】
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