zhè shì lāliàn.

• 这 = this
• 是 = is / am / are in the sense of identifying something
• 拉链 = zipper

So the structure is:

这 + 是 + 拉链
this + is + zipper

It is a very basic identification sentence: This is a zipper.

Chinese does not use articles the way English does. There is no direct equivalent of a/an or the that must appear before a noun.

So:

• 这是拉链 = This is a zipper
• not because Chinese is “missing” a word, but because Chinese simply does not require articles here.

If you want to emphasize one, you can say:

• 这是一个拉链。 = This is a zipper / This is one zipper.

But in many cases, 一个 is optional and often unnecessary.

Both can be used, but they are not exactly the same.

• 这 can stand alone and means this
• 这个 often means this one or this + classifier

In a simple identification sentence, 这是拉链 is perfectly normal.

You may also hear:

• 这个是拉链。

That can sound a bit more conversational or contrastive, like This one is a zipper.

A useful way to think about it:

• 这 = this
• 这个 = this one

So 这是拉链 is a clean textbook-style sentence.

Measure words are usually needed when a noun is counted or directly modified by a demonstrative.

For example:

• 一个拉链 = one zipper
• 这个拉链 = this zipper

But in 这是拉链, 拉链 is the noun being identified after 是, so a measure word is not required.

That is why both of these are possible:

• 这是拉链。
• 这是一个拉链。

The first is more direct and simple.
The second adds the idea of a / one.

In this sentence, pronounce it as zhè.

So the whole sentence is:

zhè shì lāliàn

About zhè vs zhèi:

• 这 is commonly given as zhè
• In natural speech, especially before a measure word, many speakers say something closer to zhèi

For example:

• 这个 is often pronounced more like zhège or zhèige / zhèi ge depending on accent and speaking style

But for 这是拉链, zhè is the standard pronunciation to learn.

是 links one noun phrase to another for identification.

So in 这是拉链, it means:

This is a zipper.

It is used when saying that something is something else.

Examples:

• 这是书。 = This is a book.
• 他是老师。 = He is a teacher.

But Chinese does not use 是 in every place where English uses is.
For example, with adjectives, Chinese usually does not use 是:

• 她很高。 = She is tall.
• not 她是高

So in this sentence, 是 is correct because 拉链 is a noun.

Not if you mean This is a zipper.

• 这是拉链。 = a full sentence: This is a zipper.
• 这拉链 is not the normal way to say that

If you want to say this zipper, you would normally say:

• 这个拉链

So 是 is needed here because it makes the sentence an identification sentence.

It is one word made of two characters:

• 拉 = pull
• 链 = chain

Together, 拉链 means zipper.

This is very common in Chinese: one word may contain two characters.

Pronunciation:

• lā = first tone
• liàn = fourth tone

So it is:

lāliàn

Yes, especially in situations like:

• teaching vocabulary
• labeling objects
• pointing to something in a picture
• identifying a part of clothing or a bag

For example, a teacher might point and say:

• 这是拉链。 = This is a zipper.

In real conversation, native speakers might also say things like:

• 这是个拉链。
• 这个是拉链。
• 这是衣服上的拉链。 = This is the zipper on the clothes.

So the sentence is natural, though it sounds a little like a basic teaching/example sentence because it is very short and simple.

The easiest way is to add 吗 at the end:

• 这是拉链吗？ = Is this a zipper?

This is the standard yes/no question pattern:

statement + 吗

So:

• 这是拉链。 = This is a zipper.
• 这是拉链吗？ = Is this a zipper?

Use 不是:

• 这不是拉链。 = This is not a zipper.

Pattern:

这 + 不是 + noun

Examples:

• 这不是书。 = This is not a book.
• 这不是拉链。 = This is not a zipper.

So the negative of 是 is 不是.

No strong pause is needed. Say it smoothly as one short sentence:

zhè shì lāliàn

There are natural word boundaries, but in normal speech it should flow.

A good rhythm is:

• 这 / 是 / 拉链

with slightly more natural connection between 这 and 是.

The tones are:

• 这 zhè — 4th tone
• 是 shì — 4th tone
• 拉 lā — 1st tone
• 链 liàn — 4th tone

So the pattern is:

4th + 4th + 1st + 4th

A common issue for learners is making every syllable too separate or too flat. Try to keep:

• zhè falling
• shì falling
• lā high and level
• liàn falling

So it should sound something like:

ZHÈ SHÌ LĀ LIÀN

with clear tone contrast, especially between lā and the surrounding 4th tones.