wǒ zuò zài zuǒbiān, tā zuò zài yòubiān.

In this sentence, 坐在 + place is the natural pattern:

• 坐 = to sit
• 在 = at / in / on
• 左边 = the left side

So 坐在左边 means sit on the left side or be seated on the left side.

Mandarin often uses:

verb + 在 + place

Examples:

• 站在门口 = stand at the doorway
• 放在桌子上 = put it on the table
• 坐在左边 = sit on the left side

If you say 我在左边坐, it sounds unnatural in normal Mandarin for this meaning.

Here, 在 introduces the location of the action.

So:

• 我坐在左边 = I sit/am seated on the left side
• 她坐在右边 = She sits/is seated on the right side

A useful comparison:

• 我在左边 = I am on the left side
• 我坐在左边 = I am sitting / seated on the left side

So adding 坐 makes the sentence more specific: it tells you the person is seated there.

左边 and 右边 literally mean the left side and the right side.

• 左 = left
• 右 = right
• 边 = side

Using 边 makes the phrase sound complete and natural when talking about position.

So:

• 左边 = left side
• 右边 = right side

Just 左 and 右 are often used more like modifiers, for example:

• 左手 = left hand
• 右脚 = right foot

When talking about where someone is located, 左边 / 右边 is very common.

In standard Mandarin, 坐在左边 / 坐在右边 is the safer and more natural form.

• 我坐在左边 = natural
• 她坐在右边 = natural

You may hear shortened forms in casual speech, but for learners, it is best to use 坐在 + place.

So if you are describing where someone is sitting, keep 在.

坐 can describe the seated position, not only the action of sitting down.

In this sentence, it usually means:

• to sit
• to be seated

So 我坐在左边 often means I am sitting / seated on the left side, not necessarily I am in the process of sitting down.

If you specifically want to emphasize sit down, Mandarin often uses:

• 坐下 = sit down

Compare:

• 我坐在左边 = I am sitting on the left side
• 我坐下了 = I sat down

Yes. In modern standard Mandarin:

• 她 = she
• 他 = he
• 它 = it

All three are pronounced tā.

The difference is clear in writing, but not in speech. In spoken Mandarin, you understand which one is meant from context.

So in this sentence, 她坐在右边, you know it means she sits on the right side because the written character is 她.

The pinyin is:

• 左边 = zuǒbiān
• 右边 = yòubiān

Tone breakdown:

• 左 = third tone
• 边 = first tone
• 右 = fourth tone
• 边 = first tone

A few pronunciation tips:

• zuǒ starts with a sound like dz/zw plus wo-type vowel coloring
• biān has a clear first tone, high and level
• yòu is a falling fourth tone

So say them approximately like:

• zuǒbiān
• yòubiān

Do not make 边 neutral here; it is normally pronounced with first tone.

Yes, usually 左边 and 右边 depend on some reference point, often the speaker’s or the relevant scene’s perspective.

For example, if two people are sitting next to each other, 我坐在左边，她坐在右边 usually means:

• from the viewpoint being used in the conversation,
• I am on the left,
• she is on the right.

If perspective might be confusing, Chinese speakers can add context, such as:

• 在我左边 = on my left
• 在她右边 = on her right

Chinese often repeats the same verb structure for clarity and balance.

So:

• 我坐在左边
• 她坐在右边

This sounds neat, natural, and easy to understand.

You could sometimes shorten the second half if the context is very clear, but repeating it is very common and often better for learners.

This kind of parallel structure is very normal in Mandarin.

The comma ， separates two related clauses:

• 我坐在左边
• 她坐在右边

It works a bit like and or a pause in English, though Chinese often does not need a word like and here.

Also notice that Chinese punctuation is full-width:

• comma: ，
• period: 。

So the sentence is written naturally as:

我坐在左边，她坐在右边。

Yes, absolutely. The pattern stays the same.

Examples:

• 我坐在左边，小王坐在右边。
• 妈妈坐在左边，爸爸坐在右边。

So the structure is:

A 坐在左边，B 坐在右边。

This makes the sentence pattern very useful for describing seating arrangements.