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I'm trying to understand the following:

> 後輩にサイフを開かせることはないよ

I guess this could be generalized as AにBをCさせる.

It's confusing. Maybe if someone can break down how to understand this and
then I can memorize it.
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2011-07-28T18:40:30.217
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2011-07-29T09:28:07.210
2011-07-28T18:58:58.723
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question
particles syntax
How to break down who did what in AにBをCさせる
Usually, you have a sentence like:

> 後輩がサイフを開く  
>  koohai ga saihu wo hirak-u  
>  'the junior opens the wallet'

where the subject takes `が` and the object takes `を`.

There is a morpheme `-(s)ase-` 'let', 'make' that expresses causative. The way
you use it is that you embed the sentence, and change the embedded subject `が`
into `に`, take another subject that will be the causer.

> 君が後輩にサイフを開かせる  
>  kimi ga [koohai **ni** saihu wo hirak]-ase-ru  
>  'you let [the junior open the wallet]'

In your example, the subject `君が` is actually omitted, so you have

> 後輩にサイフを開かせる
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2011-07-28T19:13:07.723
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2011-07-28T22:42:07.277
2011-07-28T22:42:07.277
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answer
Sometimes i _process_ it like this:

(Zが) トムが: **Tom**

(Aに) 後輩に: _towards_ / _unto_ **junior**

(Bを) サイフを: _take_ / _consume_ **wallet**

(Cさせる) 開かせる: _let_ / _made_ \+ **open**

= Tom let/made junior open the wallet.
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2011-07-29T09:28:07.210
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2011-07-29T09:28:07.210
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answer