gireul geonneol ttae sinhodeungeul jal hwaginhaeyo.

Because 때 means time / when, and the verb before it has to be in a form that modifies a noun.

• Dictionary form: 건너다 = to cross
• Before 때: 건널 때 = when crossing / when you cross

So 길을 건널 때 means when crossing the street.

A simple way to think about it is:

• 건너다 = the basic verb form
• 건널 = the form used before a noun like 때

때 means time or when.

In this sentence, 건널 때 means when crossing or at the time of crossing.

So the first part of the sentence sets the situation, and the second part tells you what to do in that situation.

• 길을 건널 때 = when crossing the street
• 신호등을 잘 확인해요 = check the traffic light carefully

Because there are two different verbs, and each verb has its own object.

1. 길을 건널 때

   • 길을 = the street
   • 건너다 = to cross
     Here, 길 is the thing being crossed, so it gets 을.

2. 신호등을 잘 확인해요

   • 신호등을 = the traffic light
   • 확인하다 = to check / confirm
     Here, 신호등 is the thing being checked, so it also gets 을.

So both 길 and 신호등 are objects, but of different verbs.

Yes, 잘 literally often means well, but in this kind of sentence it is better understood as:

• carefully
• properly
• thoroughly

So 신호등을 잘 확인해요 does not mean something strange like confirm the traffic light well in awkward English. It means check the traffic light carefully or make sure you check the traffic light properly.

With 확인하다, 잘 often adds the feeling of being careful and paying attention.

Not quite. 확인하다 means:

• to check
• to confirm
• to make sure

So 신호등을 확인해요 is stronger than just look at the traffic light. It means check the signal and make sure it is safe / correct.

That is why 확인하다 is a good verb in a safety sentence like this.

Good question. 확인해요 is grammatically a polite -요 form, and it can sound like:

• a polite statement
• a gentle instruction
• a general safety reminder

In Korean, especially in educational materials, public guidance, or safety messages, this kind of -요 ending is often used to sound friendly and less forceful.

Compare:

• 확인해요 = check it / please check it / one should check it
  Friendly, gentle, instructional
• 확인하세요 = please check it
  More direct as a command/request

So in context, 확인해요 can function very naturally as advice or instruction.

Yes, the subject is omitted.

Korean often leaves out the subject when it is obvious from context. In this sentence, the implied subject is something like:

• you
• people
• we in a general sense

So the sentence is giving a general instruction to anyone crossing the street.

This is very normal in Korean.

신호등 means traffic light or signal light.

In this sentence, it most naturally refers to the crossing signal / traffic signal you should check before crossing the street.

Depending on context, 신호등 can refer to:

• vehicle traffic lights
• pedestrian crossing signals
• the signal system at an intersection in general

Here, the important idea is the signal that tells you whether it is safe to cross.

Korean word order is different from English.

The sentence is:

• 길을 건널 때 = when crossing the street
• 신호등을 잘 확인해요 = check the traffic light carefully

A more literal order would be:

Street cross-when, traffic light carefully check.

Korean usually puts:

• time or situation first
• objects before verbs
• the main verb at the end

So the structure is very normal for Korean.

A natural pronunciation is close to:

기를 건널 때 신호등을 화긴해요

A few useful pronunciation notes:

• 길을 is often pronounced like 기를
• 확인 is commonly pronounced like 화긴
• 건널 때 keeps the tense 때 sound clearly

So even though the spelling is 길을 and 확인, the spoken form may sound a little different from what an English-speaking learner expects.

It can cover the general time around crossing the street, but in real-life meaning here, it usually implies when you are about to cross or when crossing.

In a safety sentence like this, the practical meaning is:

Before you cross, make sure you check the signal carefully.

So even if the Korean expression is broad, the real-world interpretation is very natural and sensible from context.