chuángdān búyòng jìnpào.

to soak

Breakdown of chuángdān búyòng jìnpào.

• 床单chuángdān: bed sheet
• 不用búyòng: need not; do not need to

Questions & Answers about chuángdān búyòng jìnpào.

What is the basic grammar pattern in 床单不用浸泡?

A useful way to read it is:

Topic/Noun + 不用 + Verb

So here:

• 床单 = bed sheet / bed sheets
• 不用 = do not need to / there is no need to
• 浸泡 = soak

The whole sentence means something like:

As for bed sheets, there is no need to soak them.

This kind of structure is very common in instructions, product labels, and household directions.

Why is 不用 pronounced búyòng instead of bùyòng?

This is because of tone sandhi.

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

Since 用 yòng is fourth tone, 不用 is pronounced:

búyòng

This is a very common pronunciation rule in Mandarin.

Is 不用 the same as 不要?