Nếu em sốt vào tối nay, chị sẽ đi cùng em đến bệnh viện.

Vietnamese usually uses kinship terms as personal pronouns. In this sentence:

• chị = an older female speaker
• em = a younger person the speaker is talking to

So chị sẽ đi cùng em literally looks like older sister will go with younger sibling, but in real usage it often just means I will go with you, depending on the relationship.

This tells you something about the speakers:

• the speaker is female
• the speaker is older than the listener
• the tone is familiar and caring

A very important point: em and chị do not always mean actual siblings. They are often just social pronouns.

Here, em means you because the speaker is referring to the listener.

In Vietnamese, words like em, anh, chị, cô, chú, etc. can mean either I or you depending on who is speaking and who is being addressed.

In this sentence:

• Nếu em sốt... = If you have a fever...
• chị sẽ... = I will...

So you have to understand pronouns from the relationship and context, not from fixed English-style meanings.

Nếu means if. It introduces the condition:

• Nếu em sốt vào tối nay = If you have a fever tonight

This is a very common pattern:

• Nếu + condition, main clause
• Nếu trời mưa, tôi sẽ ở nhà.
• Nếu em mệt, chị nghỉ với em.

Vietnamese conditionals are usually quite straightforward. Nếu is the key word marking the if clause.

Vietnamese often does not need a separate verb like to be in places where English does.

Here, em sốt literally looks like you fever, but it means:

• you have a fever
• you are feverish

So sốt works naturally as the predicate.

This is very common in Vietnamese:

• em mệt = you are tired
• em đói = you are hungry
• em bệnh = you are sick

English requires are / have, but Vietnamese often does not.

Yes. Em bị sốt is also natural.

The difference is roughly:

• em sốt = simple, direct, common
• em bị sốt = also common, but slightly more explicitly describes being affected by the condition

In everyday speech, both are possible. In this sentence, em sốt sounds very natural and efficient.

Yes, tối nay alone would also be natural.

• Nếu em sốt tối nay...
• Nếu em sốt vào tối nay...

Both can be understood, but tối nay by itself is often more common in casual speech.

Here, vào means something like on / during / at a time. It helps introduce the time phrase:

• vào sáng mai = tomorrow morning
• vào cuối tuần = on the weekend

So vào tối nay is not wrong, but many speakers might simply say tối nay.

Sẽ marks future meaning, similar to will in English.

• chị sẽ đi cùng em đến bệnh viện = I will go with you to the hospital

In conditional sentences, sẽ is very common in the main clause, especially when talking about a future result:

• Nếu em sốt, chị sẽ đi cùng em.

However, in everyday Vietnamese, sẽ can sometimes be omitted if the future meaning is already clear from context:

• Nếu em sốt tối nay, chị đi cùng em đến bệnh viện.

That version can still sound natural. Adding sẽ just makes the future meaning more explicit.

The structure is:

• đi = go
• cùng em = with you
• đến bệnh viện = to the hospital

So the sentence builds like this:

• go
• with you
• to the hospital

Vietnamese often places these complements directly after the verb in a natural sequence. So:

• chị sẽ đi cùng em đến bệnh viện = I will go with you to the hospital

You may also hear slightly different phrasing, such as:

• chị sẽ cùng em đi đến bệnh viện
• chị sẽ đi đến bệnh viện cùng em

But the original version is very normal.

Cùng means together with or with in the sense of accompanying someone.

So:

• đi cùng em = go with you
• ăn cùng bạn = eat with a friend
• ở cùng gia đình = live with the family

In this sentence, cùng emphasizes accompaniment: the speaker is not just going to the hospital; she is going with the younger person.

Đến means to / arrive at / reach in this kind of structure.

• đến bệnh viện = to the hospital
• đến trường = to school
• đến nhà = to the house/home

You could also hear tới bệnh viện, which is very similar in meaning.

In this sentence, đi ... đến bệnh viện expresses movement toward the hospital.

No, Vietnamese does not use articles like a, an, or the the way English does.

So bệnh viện can mean:

• a hospital
• the hospital

The exact meaning comes from context.

In this sentence, English naturally says the hospital, but Vietnamese simply says bệnh viện.

It is not strictly necessary, but it is helpful.

• Nếu em sốt vào tối nay, chị sẽ đi cùng em đến bệnh viện.
• Nếu em sốt vào tối nay chị sẽ đi cùng em đến bệnh viện.

The version with the comma is easier to read because it clearly separates:

• the if-clause
• the main clause

In writing, using the comma here is a good idea.

Yes. A few very natural alternatives are:

• Nếu em sốt tối nay, chị sẽ đưa em đến bệnh viện.
• Nếu tối nay em sốt, chị sẽ đi với em đến bệnh viện.
• Nếu em bị sốt tối nay, chị sẽ đi cùng em tới bệnh viện.

A useful note: if the idea is specifically take someone to the hospital, many speakers might prefer đưa em đến bệnh viện rather than đi cùng em đến bệnh viện.

The original sentence is still correct, but đưa can sound a little more direct if the speaker is helping the other person get there.

It sounds caring, protective, and close.

That feeling comes from:

• the pronouns chị and em
• the future promise sẽ đi cùng em
• the situation of helping someone who may be sick

So this is not a neutral textbook if... then... sentence. It also shows relationship and concern. That social aspect is very important in Vietnamese.