As they were introduced, George reached his hand out to the Japanese student.
out 在这里做宾补还是状语，我感觉是状语 但仿佛宾补也说得通， his hand is out.
我提供一种剖析办法。假如按夸克的剖析办法，这种小品词和动词的关系非常紧密，被看做是谓语动词的一部分。譬如，These two people fell out.这种被剖析为sv结构。所以,楼主的句子直到out，应该是svo结构。to 介词短语作状语。
