wǒ juéde xué shùxué bú tài róngyì.

A simple way to break it down is:

• 我 = I
• 觉得 = think / feel
• 学数学 = study math
• 不太容易 = not very easy / not so easy

So the pattern is:

Subject + 觉得 + activity/clause + adjective phrase

In other words:

I + think + studying math + is not very easy

Chinese often lets you put a whole action phrase after 觉得 as the thing you are commenting on.

觉得 means to feel or to think, especially for a personal opinion or impression.

In this sentence, 我觉得 means:

• I think...
• I feel that...

It sounds natural and conversational. It is softer and more personal than a more formal word like 认为.

So:

• 我觉得学数学不太容易。 = I think studying math is not very easy.
• It expresses a personal viewpoint, not an absolute fact.

Because 学数学 is the thing the speaker is giving an opinion about.

Chinese often works like this:

• 我觉得 + [something/some activity] + [description]

Here:

• 学数学 = studying math
• 不太容易 = not very easy

So the sentence means:

I think [studying math] [is not very easy].

This is very common in Mandarin. After 觉得, you can put:

• a noun phrase
• an action
• or a whole clause

For example:

• 我觉得中文很有意思。 = I think Chinese is very interesting.
• 我觉得跑步不难。 = I think running is not hard.

Because 容易 is an adjective, and in Chinese, adjectives can directly act as the predicate.

So Chinese says:

• 学数学不太容易
• literally: Studying math not very easy

You do not need 是 before an adjective in this kind of sentence.

Compare:

• 他很高。 = He is tall.
• 这个问题很难。 = This question is difficult.
• 学数学不太容易。 = Studying math is not very easy.

Using 是 here would sound unnatural.

不太 means not very, not so, or not really all that.

It softens the statement. It is less strong than simply saying something is difficult.

So:

• 不太容易 = not very easy / not so easy
• This is milder than 很难 = very hard

Compare these:

• 容易 = easy
• 不容易 = not easy
• 不太容易 = not very easy / not so easy

So 不太 makes the sentence sound a bit less direct and a bit more natural in many situations.

This is because of 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:

• 不太 becomes bú tài

Since 太 is fourth tone, 不 changes from bù to bú.

This only changes the pronunciation, not the meaning.

Examples:

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

It can mean both, depending on context.

In this sentence, 学数学 most naturally means:

• to study math
• or to learn math

In English, study math sounds slightly more natural here, because we are talking about the subject as an ongoing activity.

So:

• 学中文 = study/learn Chinese
• 学开车 = learn to drive
• 学数学 = study/learn math

Chinese often uses 学 very broadly, where English may choose either learn or study.

数学 is the normal word for mathematics or math.

It is a full noun:

• 数 relates to numbers
• 学 here means study/learning as part of a subject name

Together, 数学 means mathematics.

A learner should also notice that 数 has different pronunciations in different words, but here it is:

• 数学 = shùxué

So do not pronounce it as shǔxué in this sentence.

容易 is an adjective meaning easy.

In Chinese, adjectives often behave a bit like verbs in sentences because they can directly serve as the predicate.

So:

• 这个很容易。 = This is easy.
• 学数学不太容易。 = Studying math is not very easy.

Even though English uses is, Chinese usually does not need an extra word like that here.

Yes, you could, and it is natural.

But there is a small nuance:

• 我觉得学数学不太容易。 = I think studying math is not very easy.
• 我觉得数学不太容易。 = I think math is not very easy.

The first version focuses more on the activity of studying math.

The second version focuses more on math as a subject.

In everyday speech, both can work, and the difference is often small.

Sometimes, yes.

Chinese often omits the subject when it is obvious from context.

So in conversation, you might simply say:

• 觉得学数学不太容易。

But as a complete standalone sentence for a learner, 我觉得 is clearer and more natural.

Including 我 is especially helpful when:

• you are stating your personal opinion
• the speaker is not already obvious
• you want a full, clean sentence

Yes, but 学数学 is usually more natural in everyday speech.

Compare:

• 学数学 = common, simple, conversational
• 学习数学 = slightly more formal or written

Both are correct, but 学 is very often enough in spoken Mandarin.

So:

• 我觉得学数学不太容易。 sounds very natural.
• 我觉得学习数学不太容易。 is also correct, but a bit more formal.

You can change the difficulty level by changing the final part.

For example:

• 我觉得学数学不太容易。 = I think studying math is not very easy.
  
  • soft, moderate
• 我觉得学数学不容易。 = I think studying math is not easy.
  
  • a bit stronger
• 我觉得学数学很难。 = I think studying math is very hard.
  
  • much stronger
• 我觉得学数学有点难。 = I think studying math is a little hard.
  
  • softer and more conversational

So 不太容易 is a nice middle-ground expression: natural, polite, and not overly strong.