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I encountered a question in my JLPT n1 practice book , and I got really
confused because I was sure my answer was right but when I look at the answer
sheet the answer is really far from what I have learned so far.

the question was

```

    その日、私はホームに入ってきた電車に飛び乗った。ところが、電車は反対方向に走り始めた（　　　　　　）。
    私は電車の行き先を確かめなかったことを後悔した。
    １．ではない
    ２．ではないか
    ３．のではない
    ４．のではないか
    
```

my answer was 4 but it says on the book its 2. Up until now I know that I have
to put の after verb+た or verb +る in order to place ではないか.

and the sentence "私はホームに入ってきた電車に飛び乗った。" really confuse me Does it mean " I
took the train that just arrived" ?

can someone help me with this one?
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2015-08-23T15:27:19.203
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2015-08-24T21:57:06.510
2015-08-24T21:57:06.510
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question
translation syntax jlpt
た＋ではないか　or た＋のではないか can someone enlighten me?
This `[verb] + ではないか` is an exclamatory phrase which denotes the speaker's
surprise or accusation.

> [*]電車は反対方向に走り始めた **ではない** 。 (Ungrammatical)
>
> 電車は反対方向に走り始めた **ではないか** 。  
>  **(To my surprise,)** The train started to run in the opposite direction!
>
> 電車は反対方向に走り始めた **のではない** 。  
>  It is not that the train started to run in the opposite direction.
>
> 電車は反対方向に走り始めた **のではないか** 。  
>  **(I wonder,)** Didn't this train start to run in the opposite direction?

4 is incorrect, because the following sentence says 後悔した, which indicates he
realized (rather than just wondered) something bad in the second sentence.
CC BY-SA 3.0
2015-08-24T21:43:41.127
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2015-08-24T21:50:41.367
2015-08-24T21:50:41.367
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answer