wǒ zhīsuǒyǐ juéde zhè jǐ tiān yālì hěn dà, shì yīnwèi zuòyè tài duō, jiéguǒ xīnqíng yìzhí bú tài hǎo.

This is a common pattern meaning the reason why ... is because ....

Structure:

• 我之所以觉得这几天压力很大 = The reason I feel a lot of pressure these past few days
• 是因为作业太多 = is because there is too much homework

So 之所以 introduces the situation/result, and 是因为 introduces the reason.

This pattern is a bit more formal and organized than just saying:

• 因为作业太多，所以我觉得这几天压力很大。

Both are correct, but 之所以...是因为... puts special emphasis on explaining the reason.

觉得 means to feel or to think.

In this sentence:

• 我觉得这几天压力很大 means
• I feel that the pressure has been great these past few days

Everything after 觉得 is the content of the feeling/thought:

• 这几天压力很大

So the structure is:

• 我觉得 + clause

This is very common in Mandarin:

• 我觉得他很好。
• 我觉得这个办法不错。

Here, 这几天 means these past few days or these last few days.

In this phrase, 几 does not mean how many?
Instead, it means a few / several.

So:

• 这几天 = these few days / these days
• 过几天 = in a few days
• 前几天 = a few days ago

This use of 几 is very common when the exact number is not important.

In Mandarin, adjectives can directly act as the predicate, so you often do not need 是 before an adjective.

So:

• 压力很大 = the pressure is great / the pressure is high

Not:

• 压力是很大 in a neutral statement

A key point for English speakers: Chinese often uses an adjective directly where English uses to be + adjective.

Examples:

• 他很忙。 = He is busy.
• 天气很冷。 = The weather is cold.
• 心情不好。 = The mood is bad / one is in a bad mood.

Sometimes yes, but not always exactly.

In Chinese, 很 often appears before adjectives in normal statements, even when the speaker does not want to strongly emphasize very. It can sometimes function more like a natural linker before the adjective.

So:

• 压力很大 can mean the pressure is great / quite high / very high, depending on context.

In this sentence, since the speaker is talking about stress from too much homework, 很大 does carry real emphasis, so a lot of pressure or very high pressure is a natural understanding.

作业 means homework and usually works like a mass or collective noun in Chinese. It does not need to show singular/plural the way English often does.

So:

• 作业太多 = there is too much homework

You do not need a measure word here. This pattern is very normal:

• 工作太多 = too much work
• 人太多 = too many people
• 事情太多 = too many things

The adjective 多 expresses quantity here.

Here 结果 means as a result or consequently.

It is not being used as the noun result here. Instead, it works like a connector showing what happened afterward.

So:

• 作业太多，结果心情一直不太好。 = There was too much homework, and as a result, my mood has not been very good.

It often introduces an outcome, sometimes one that feels noticeable or undesirable.

Yes, in many situations you could say 所以 instead, but the nuance is a little different.

• 所以 = so / therefore
• 结果 = as a result / in the end

In this sentence:

• 所以心情一直不太好 sounds like a straightforward cause-and-effect statement.
• 结果心情一直不太好 emphasizes the resulting state a bit more, almost like and that ended up making my mood bad.

So both can work, but 结果 highlights the outcome more clearly.

一直 means continuously, all along, or the whole time.

So:

• 心情一直不太好 means
• my mood has not been very good the whole time or
• I’ve been in a not-so-good mood continuously

It shows that this is not just a one-time feeling, but an ongoing state over those days.

Examples:

• 我一直很忙。 = I’ve been busy the whole time.
• 他一直在等你。 = He has been waiting for you all along.

不太好 means not very good or not so good. It is softer and more natural in many everyday situations than 很不好.

Compare:

• 不太好 = not very good / not so good
• 很不好 = very bad

When talking about mood, health, weather, or general conditions, Chinese often prefers this softer wording:

• 我今天不太舒服。 = I’m not feeling very well today.
• 他最近状态不太好。 = He hasn’t been in very good shape recently.

So 心情一直不太好 sounds natural and conversational.

This is a pronunciation rule called tone sandhi.

Normally 不 is fourth tone: bù.
But when 不 comes before another fourth-tone syllable, it changes to second tone: bú.

Here:

• 太 is fourth tone: tài
• so 不太 is pronounced bú tài

Examples:

• 不是 → bú shì
• 不对 → bú duì
• 不太 → bú tài

This is only a pronunciation change; the character is still written 不.

Chinese often leaves out possessive words like 我的 when the meaning is already clear from context.

Here the subject is already 我, so:

• 结果心情一直不太好 naturally means
• as a result, my mood has not been very good

You could say:

• 结果我的心情一直不太好 but it is a bit more explicit and slightly heavier.

Chinese often prefers the shorter version when the owner is obvious.

The sentence can be divided like this:

• 我之所以觉得这几天压力很大 = the situation being explained
• 是因为作业太多 = the reason
• 结果心情一直不太好 = the resulting consequence

So the flow is:

1. state the feeling/problem
2. give the reason
3. show the result

That makes the sentence feel logical and well connected:

• The reason I’ve felt a lot of pressure these past few days is that there’s too much homework, and as a result, my mood hasn’t been very good.

Yes, it is natural, though the 之所以...是因为... part is a little more formal or carefully structured than very casual speech.

A more casual version might be:

• 这几天我觉得压力很大，因为作业太多，心情也一直不太好。

But the original sentence is completely normal and clear. It sounds like someone explaining their situation in a slightly more organized way, such as in conversation, writing, or a class exercise.