jīntiān wǒ shēntǐ bùshūfu, suǒyǐ xiǎng qǐngjià huíjiā xiūxi.

Yes. Both 今天我身体不舒服... and 我今天身体不舒服... are natural.

In Chinese, time words often come:

• before the subject: 今天我...
• or after the subject: 我今天...

Putting 今天 first gives a slight feeling of setting the scene: As for today...

A helpful way to see it is:

• 今天 = time
• 我 = subject
• 身体不舒服 = condition/state
• 所以 = result marker, so
• 想 = want to
• 请假 = ask for leave
• 回家 = go home
• 休息 = rest

So the pattern is roughly:

Time + Subject + Condition + so + Intention + Action

Chinese often links actions in a row like this without adding extra words such as to or and every time.

Yes, you absolutely can say 我不舒服. That is very common.

Adding 身体 makes it clearer that you mean your physical condition. It helps distinguish physical discomfort from emotional discomfort.

Compare:

• 我不舒服 = I don’t feel well / I’m uncomfortable
• 我身体不舒服 = I don’t feel well physically

In everyday speech, both are fine.

Yes, literally it does. But in real usage, it often means:

• not feeling well
• feeling sick
• feeling physically unwell
• having some kind of bodily discomfort

It is broader and softer than saying someone is definitely ill. For example, it can cover:

• a headache
• nausea
• fatigue
• stomach pain
• general discomfort

So it often works like I’m not feeling well in English.

No, you do not need 因为.

所以 means so / therefore, and it can appear by itself when the reason is already clear from the previous part of the sentence.

This sentence says:

• 我身体不舒服 = I’m not feeling well
• 所以想请假回家休息 = so I want to ask for leave and go home to rest

You could also use the full pattern:

• 因为今天我身体不舒服，所以想请假回家休息。

That means Because I don’t feel well today, I want to ask for leave and go home to rest.

Both are correct.

Because the subject is already obvious.

Chinese often omits repeated subjects when there is no confusion. So:

• 今天我身体不舒服，所以想请假回家休息。

is understood as:

• 今天我身体不舒服，所以我想请假回家休息。

Both are grammatical. The version without the second 我 sounds a bit smoother and more natural.

Here 想 means something like:

• want to
• would like to
• am thinking of

It is softer than a very strong English want in some contexts.

Compare:

• 想请假 = want to ask for leave / would like to ask for leave
• 要请假 = am going to ask for leave / need to ask for leave / want to ask for leave

想 often sounds less forceful and more polite than 要, so it fits well in this sentence.

请假 means to ask for leave from work, school, or some other obligation.

It does not mean take a vacation in a casual sense. It specifically means requesting time off.

Common patterns:

• 向老师请假 = ask the teacher for leave
• 跟老板请假 = ask the boss for leave
• 请一天假 = ask for one day off

In your sentence, the person being asked is omitted because it is understood from context.

This is a very common Chinese pattern. Chinese often puts verbs one after another in a serial verb construction.

So:

• 请假回家休息

can be understood as:

• ask for leave, go home, and rest
• ask for leave in order to go home and rest

English usually needs linking words like and or to, but Chinese often does not.

Here the flow is very natural:

1. 请假 = ask for leave
2. 回家 = go home
3. 休息 = rest

Yes, but the meaning changes slightly.

• 身体不舒服 = physically unwell / not feeling well
• 生病了 = got sick / am ill

身体不舒服 is broader and softer. It does not always mean a clear illness.
生病了 is more direct and stronger.

Compare:

• 今天我身体不舒服，所以想请假回家休息。
• 今天我生病了，所以想请假回家休息。

Both are correct, but the second one sounds more definite: I am sick.

Very often, yes.

In natural speech:

• 舒服 is often pronounced shūfu
• 休息 is often pronounced xiūxi

That means the second syllable is commonly a neutral tone.

A few pronunciation notes:

• 不舒服 is usually bù shūfu
• The 不 stays fourth tone here because the next syllable shū is not fourth tone
• If 不 came before a fourth-tone syllable, it would usually change to bú

So:

• 不对 → búduì
• but 不舒服 → bùshūfu

No. Standard written Chinese normally does not put spaces between words.

A native-style sentence would be written like this:

今天我身体不舒服，所以想请假回家休息。

The spaces in your version are there only to help learners see the word boundaries.

Yes, it is natural and understandable.

It sounds like a straightforward explanation:

• Today I’m not feeling well, so I want to ask for leave and go home to rest.

If you want to sound a bit softer or more polite, you could say:

• 今天我身体有点不舒服，所以想请假回家休息。

Adding 有点 means a little, which often makes the statement sound gentler.

You could also make it more formal by adding who you are asking:

• 今天我身体不舒服，想跟老师请假回家休息。
• 今天我身体不舒服，想向主管请假回家休息。