Question 1

What does the particle が after 急行 signify?

Accepted Answer

In this sentence, が marks 急行 (express train) as the subject of the verb 止まらなければ. Using が simply points out what “doesn’t stop.” If you used は instead (急行は止まらなければ…), you’d be setting “express train” as a topic, often implying contrast (e.g. “as for the express train…”).

Question 2

What kind of condition is 止まらなければ, and how is it formed?

Accepted Answer

止まらなければ is the negative conditional (the -ba form) of 止まる (to stop). Formation steps:  
1. Take the negative form: 止まらない  
2. Drop い → 止まらな  
3. Add ければ → 止まらなければ  
It means “if (it) does not stop.”

Question 3

How does this -ば conditional differ from the -たら or -と conditionals?

Accepted Answer

– ～ば (なければ): logical or formal conditional, often in writing or when stating facts.  
– ～たら: more colloquial, can express hypothetical or past-based conditions.  
– ～と: indicates a natural or guaranteed result; can’t express volition or commands.  
Here 止まらなければ states a logical condition: “If the express doesn’t stop…”

Question 4

Why is there a comma after 止まらなければ?

Accepted Answer

The comma (、) separates the conditional clause (止まらなければ) from the main clause (次の駅まで行く), clarifying “If X…, then Y.” Japanese often uses commas to mark clause boundaries.

Question 5

What function does まで serve in 次の駅まで?

Accepted Answer

The particle まで means “until” or “up to.” So 次の駅まで行く literally means “go up to the next station.” It shows the endpoint of the movement.

Question 6

Why is 次 connected to 駅 with の (as 次の駅)?

Accepted Answer

の links nouns to show possession or qualification. Here 次の qualifies 駅, giving “the next station.”

Question 7

Who is actually doing the 行く in this sentence? The train or the speaker?

Accepted Answer

The omitted subject refers back to 急行 (the express train). In Japanese, if the subject is clear, it’s dropped. So 行く describes what the train will do: “If the express doesn’t stop, it (the express) goes to the next station.”

Question 8

Could we make this polite by using 行きます instead of 行く?

Accepted Answer

Yes. In polite speech, you’d say:  
急行が止まらなければ、次の駅まで行きます。  
Switching to ～ます form makes the sentence more formal or polite.

kyuukou ga tomaranakereba, tugi no eki made iku.

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