xiān bǎ zāngyīfu hé chuángdān fàng zài xǐyīlán lǐ.

先 means first or first of all. It shows that this action should happen before some other action.

In this sentence, 先 comes near the beginning because it sets the sequence for the whole instruction:

• 先把脏衣服和床单放在洗衣篮里。
• First, put the dirty clothes and bedsheets in the laundry basket.

In Chinese, 先 is often placed before the main action to signal order very naturally.

把 is used to highlight what is being affected by the action. It often appears when the speaker wants to show what is being moved, changed, handled, or disposed of.

Structure here:

• 把 + object + verb + location/result
• 把脏衣服和床单放在洗衣篮里

So the sentence is focusing on the dirty clothes and bedsheets and telling you what to do with them: put them into the laundry basket.

Without going too deeply into grammar terms, 把 is very common when:

• moving something somewhere
• changing something
• dealing with something in a specific way

This sentence is a classic example because the clothes are being moved to a new location.

Because with a verb like 放 when you are clearly moving an object to a location, Chinese often prefers the 把-construction:

• 先把脏衣服和床单放在洗衣篮里。

The version 先放脏衣服和床单在洗衣篮里 sounds unnatural in standard Mandarin.

A more natural non-把 sentence would usually be something like:

• 先把脏衣服和床单放在洗衣篮里。
• or 先将脏衣服和床单放在洗衣篮里。 (more formal)

So in this sentence, 把 helps make the word order sound natural and clear.

Yes, sometimes 先 is flexible.

For example, these can both be natural:

• 先把脏衣服和床单放在洗衣篮里。
• 把脏衣服和床单先放在洗衣篮里。

The difference is small:

• 先把... emphasizes the sequence early
• 把...先放... places 先 closer to the verb 放

Both can work, but the version in your sentence is very common and natural for instructions.

Because 在 helps mark the location after the verb 放.

• 放在 + place = put (something) at/in/on a place

So:

• 放在洗衣篮里 = put (it) in the laundry basket

This pattern is very common:

• 放在桌子上 = put it on the table
• 放在包里 = put it in the bag

In everyday speech, some words may get shortened in casual contexts, but for learners, 放在 + place is the safest and most standard pattern.

Yes, but they do different jobs.

• 在 marks the location phrase after the verb
• 里 means inside

So:

• 在洗衣篮里
• literally: at the inside of the laundry basket
• naturally: in the laundry basket

Compare:

• 在桌子上 = on the table
• 在房间里 = in the room
• 在盒子里 = in the box

So 在 introduces the place, and 里 tells you the object is inside that place.

Here, 和 means and:

• 脏衣服和床单 = dirty clothes and bedsheets

It works very much like and when joining nouns.

A useful point: 和 is most commonly used to connect nouns or noun phrases. It is not always used exactly like English and in every kind of sentence, but in this sentence it is a very direct match.

Usually it means dirty clothes in a general or collective sense.

Chinese nouns often do not show singular/plural the way English nouns do. So 衣服 can mean:

• clothing
• clothes
• a piece of clothing

The exact meaning depends on context.

In this sentence, because it is grouped with 床单 and placed into a laundry basket, it is most naturally understood as dirty clothes in general.

Chinese often leaves that kind of information unstated if the meaning is clear from context.

So:

• 脏衣服和床单 could mean
  the dirty clothes and bedsheets,
  dirty clothes and bedsheets,
  or even your dirty clothes and bedsheets

Chinese relies much more on context than English does for articles and possession.

If needed, Chinese can be more specific:

• 你的脏衣服和床单 = your dirty clothes and bedsheets
• 那些脏衣服和床单 = those dirty clothes and bedsheets

But in simple instructions, leaving that out is very normal.

Because this is an instruction or command, and in Chinese the subject is often omitted when it is obvious.

So:

• 先把脏衣服和床单放在洗衣篮里。 naturally means:
• First, put the dirty clothes and bedsheets in the laundry basket.

The understood subject is usually you.

This is very common in Mandarin, especially in:

• instructions
• recipes
• directions
• workplace tasks
• household commands

If you add 你, it is still understandable, but often less natural unless you want emphasis:

• 你先把脏衣服和床单放在洗衣篮里。

Because this sentence is giving an instruction, not describing a completed action.

• 放 = put
• 放了 or a sentence with 了 would suggest completion or a change of state, depending on context

Here the speaker is telling someone what to do, so plain 放 is appropriate:

• 先把脏衣服和床单放在洗衣篮里。

If you said:

• 先把脏衣服和床单放在洗衣篮里了

that would not fit this instruction naturally.

So no 了 is needed.

Because the second syllable of 衣服 is usually in the neutral tone.

So it is commonly pronounced:

• yīfu

not:

• yīfú

This is very common in everyday Mandarin. Many two-syllable words have a full tone on the first syllable and a neutral tone on the second.

So when speaking naturally:

• 脏衣服 = zāng yīfu

The neutral tone is lighter and shorter.

Yes, that can also be natural.

• 放在洗衣篮里 = put it in the laundry basket
• 放进洗衣篮里 = put it into the laundry basket

The version with 进 emphasizes the motion into the basket a bit more.

So these are both fine in many contexts:

• 先把脏衣服和床单放在洗衣篮里。
• 先把脏衣服和床单放进洗衣篮里。

The sentence you were given is slightly more neutral and straightforward.

It is basically neutral everyday Mandarin.

It sounds natural for:

• household instructions
• spoken directions
• simple written instructions

It is not especially formal, but not slangy either.

If you wanted to make it more polite, you could add words like:

• 请先把脏衣服和床单放在洗衣篮里。 = Please first put the dirty clothes and bedsheets in the laundry basket.

So the original sentence is a plain, natural instruction.