They may lack motivation to make greater efforts to increase their income.前面的to do做状语,后面的to do作effort的定语可以这样理解吗?
二个不定式都是前面名词的定语。
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【答】They may lack motivation(缺乏积极性) to make greater efforts (此不定式短语是 motivation 的定语) to increase their income.(后一个不定式短语是目的状语)