Why is 会わせてあげる being used in the sentence:あなたにはお姉さんがいるの。すてきな人で有名人よ。東京へ連れて行って会わせてあげる 。


I have been practicing in the website japanesetests4you.com and I don't know
why 会わせてあげるis being used. I understand that the speaker is saying: You have a
sister（あなたにはお姉さんがいるの）. She is an amazing person and a celebrity（素敵な人で有名人よ）.
But what I don't understand is the last bit: 東京へ連れて行って会わせてあげる. Can somebody
explain me if it is using the causative form of the verb 会う and why?
手伝ってください．文の意味が分かりません。




会わせてあげる is the causative-form of 会う, followed by the subsidiary verb あげる.

  * **会う** : to meet her
  * **会わせる** : to let you meet her
  * **会わせてあげる** : to let you meet her (for you)

Here, the subject ( _I_ ), the causee ( _you_ ) and the object ( _her_ ) are
all omitted because they can be inferred from the context (as well as the use
of あげる), but the "full" version is:

> 私 **は** あなた **を** 彼女 **に** 会わせてあげる。  
>  I'll let you meet her.

The causee is marked with を because 会う is an intransitive verb. See
[this](https://japanese.stackexchange.com/a/33515/5010) for the rule.

Also note that although it's called "causative", (さ)せる is translated as
'allow', 'let' or 'make' depending on the context. Without the causative-form,
会ってあげる would mean "I'll meet her (for you)", which doesn't make sense here.

