zhǐyào nǐ duō xiūxi, shēntǐ hěn kuài jiù huì hǎoqǐlái.

It is a very common pattern meaning as long as …, then … or provided that …, then ….

In this sentence:

• 只要你多休息 = as long as you rest more
• 身体很快就会好起来 = your body will get better soon

So 只要……就…… expresses a sufficient condition: if the first part happens, the second part will follow.

Both can introduce a condition, but they are not exactly the same.

• 如果 = if
• 只要 = as long as / provided that

如果 is more neutral. It simply sets up a condition.

只要 stresses that this one condition is enough. It gives the feeling of this is all that is needed.

So in this sentence, 只要你多休息 suggests: Getting more rest is enough for recovery to happen.

If you changed it to 如果你多休息, it would sound more like a plain conditional statement, and less like reassurance.

Because 多 here works like an adverb meaning more or a lot, and in Mandarin adverbs normally come before the verb.

So:

• 多休息 = rest more / get more rest

This does not need a direct comparison stated explicitly. It can simply mean:

• rest more than you are resting now
• get plenty of rest

This is very natural Chinese word order.

Compare:

• 多喝水 = drink more water
• 多运动 = exercise more
• 多睡一点 = sleep a bit more

Here 很快 means soon or quickly.

Word by word:

• 很 = very
• 快 = fast / quick

But in actual usage, 很快 is often best understood as a set phrase meaning soon.

So:

• 身体很快就会好起来 = your body will get better soon

In many cases, 很 + adjective does not need to be translated as a strong very in English. Sometimes it is just the normal way Chinese forms a smooth predicate or adverbial expression.

就 has a few related jobs here.

1. It pairs naturally with 只要

   • 只要……就…… = as long as … then …

2. It helps show the result follows readily or naturally

   • almost like then, will, or right away / readily, depending on context

In this sentence, 就 helps connect the condition and the result:

• 只要你多休息，身体很快就会好起来。

It makes the second clause sound like the expected outcome once the condition is met.

Without 就, the sentence might still be understandable, but 只要……就…… is the standard, natural pattern.

Yes, Chinese often expresses future meaning without a word like will. But 会 is still very common.

Here 会 adds the sense of:

• future
• prediction
• likelihood

So 身体很快就会好起来 means something like:

• your body will get better soon
• your body is likely to recover soon

It sounds reassuring, like the speaker is making a confident prediction.

If you removed 会, the sentence could still work, but the tone would be a little more direct and less explicitly predictive.

好起来 means to get better, to improve, or to recover.

It is made of:

• 好 = good / better
• 起来 = to start to become / to rise into a new state

In this sentence, 起来 does not mean literally stand up. Instead, it shows a change into a new state.

So:

• 身体好起来 = the body gets better / recovers

You will see this pattern in other situations too:

• 天气暖和起来了。 = The weather has become warmer.
• 生意好起来了。 = Business has improved.
• 他心情好起来了。 = His mood has improved.

So 起来 often marks the beginning of a change.

Both are possible, but they focus slightly differently.

• 你很快就会好起来 = you will get better soon
• 身体很快就会好起来 = your body will recover soon / your health will improve soon

Using 身体 puts the focus specifically on physical condition rather than the whole person. It can sound a bit more concrete or medical.

So the sentence is not strange—it is just emphasizing the body/health itself.

The comma separates the condition from the result:

• 只要你多休息， = as long as you rest more,
• 身体很快就会好起来。 = your body will get better soon.

This is very common in written Chinese, especially with patterns like 如果……, 只要……, 虽然……, and so on.

In speech, you would naturally pause there too.

Yes. In normal Mandarin, 休息 is commonly pronounced xiūxi, with the second syllable in a neutral tone.

That is very common in everyday speech. Many two-syllable words have a lighter second syllable.

So:

• 休息 = xiūxi, not usually a strong xiūxī in normal speech

Learning neutral tone is important because it helps your Mandarin sound more natural and less overly stiff.

Not exactly.

• 多休息 = rest more / get more rest
• 好好休息 = rest well / have a good rest

So 多 focuses on quantity and 好好 focuses more on quality or manner.

Compare:

• 你要多休息。 = You need to rest more.
• 你要好好休息。 = You need to rest well / get proper rest.

Sometimes both can be used together:

• 你要多多休息，好好照顾自己。

Yes. Native speakers might say several similar versions, such as:

• 只要你多休息，很快就会好起来。
• 你多休息，很快就会好起来。
• 只要多休息，身体很快就会恢复。

The original sentence is already natural, but spoken Chinese often drops words that are clear from context.

For example, if everyone already knows you are talking about the person’s health, the speaker may omit 身体 and simply say:

• 很快就会好起来。 = You’ll get better soon.