如何区分双宾语与复合宾语?

很简单：
1 是看动词,不同的动词的用法不同,很多是接双宾语,很多却接复合宾语.
以下为复合宾语结构：
ask sb.to do sth.
tell sb. to do sth.
teach sb to do sth .
order sb. to do sth.
get sb. to do sth.
know sb. (to) do sth.
advise sb. to do sth.
recommend sb. to do sth.
help/make/let/have/see/feel/find/hear/watch/notice/listen to/look at/note/perceive/behold/observe sb. do sth.(这些都是省略不定式to的复合宾语结构)
以下都是双宾语结构：
带 to 的： bring , fetch , give , hand , leave , lend , offer , owe , pass , pay , post , promise , read , sell , send , show , take , teach , tell , throw , write 等.
带 for 的 ：book , buy , call , choose , cook , do , fetch , find , get , keep , leave , save 等.
bring/ fetch/ give/ hand/ post/promise/ read/ sell/ send/ show/ take/ teach/ tell sb. sth.
=bring/ fetch/ give/ hand/ post/ promise/ read/ sell/ send/ show/ take/ teach/ tell sth. to sb.
book/ buy / call/ choose /cook/do / fetch/ find /get/keep / leave/save sb. sth.
=book/ buy / call/ choose /cook/do / fetch/ find /get / keep/leave /savesth. for sb.
2 是看句型.
动词＋间接宾语＋直接宾语＝动词＋直接宾语＋介词to/for+间接宾语结构的就是双宾语结构
动词＋宾语＋to不定式短语 或者
动词＋宾语＋形容词/过去分词/现在分词/名词 或者
动词＋it(形式宾语)＋形容词/过去分词/现在分词/名词＋实际宾语（不定式或动名词短语或者介词短语等）
结构的就是复合宾语.
欢迎探讨词法语法问题.