Bad weather prevented him from starting out for Beijing on time等结构分析.

Bad weather prevented him from starting out for Beijing on time等结构分析.
1.Bad weather prevented him from starting out for Beijing on time.Bad weather主语,prevent终止系动词,him表语,from starting out for Beijing on time是介词词组做him的宾语补足语.2.Neither rain or snow keeps the postman from delivering out letters which we so much look forward to receiving.keeps谓语,the postman宾语,from delivering our letter介词短语做表语做postman的宾补.
还有一道3、As a result of all these factors,governments are becoming increasingly dependent on biologists and social scientists for plainning the appropriate programs and putting them into effect.
这道题的讲解是：“介词on后面表示所依赖的对象，是谓语的一部分”我很迷茫，谁帮我具体分析一下啊？