xíngli zài zhèlǐ.

Because Mandarin does not usually use 是 for location.

In English, we say The luggage is here. In Mandarin, when you want to say where something is located, you normally use 在:

• 行李在这里。 = The luggage is here.
• literally: luggage + be located at + here

Use 是 for identification, not location:

• 这是行李。 = This is luggage.
• 行李在这里。 = The luggage is here.

So in this sentence, 在 does the job that is does in English location sentences.

Here, 在 means to be at / to be in / to be located at.

In other contexts, 在 can also work like at, in, on as a preposition, but in a simple sentence like this, it is functioning as the main verb of location.

A very common Mandarin pattern is:

Subject + 在 + Place

For example:

• 书在桌子上。 = The book is on the table.
• 他在家。 = He is at home.
• 行李在这里。 = The luggage is here.

Mandarin usually puts the thing being talked about first, and then says where it is.

So the pattern is:

thing + 在 + place

That is why you get:

• 行李 = luggage
• 在 = is located at
• 这里 = here

So:

行李在这里。 = The luggage is here.

This is different from English, where here can sometimes come first, as in Here is the luggage. Mandarin usually prefers the straightforward order subject + location.

Yes. 行李 is often used as a collective noun, much like luggage in English.

It can refer to:

• one bag
• several bags
• someone’s baggage in general

Context usually makes it clear.

For example:

• 我的行李在这里。 = My luggage is here.
• 他们的行李都在这里。 = Their luggage is all here.

If you want to be specific about the number of pieces, you can add more words, such as:

• 一件行李 = one piece of luggage
• 两件行李 = two pieces of luggage

Because 行 is a character with more than one pronunciation, and in 行李 it is read xíng.

So:

• 行李 = xíngli

The second syllable 李 is often pronounced lightly here, so learners often hear it almost like a neutral-tone syllable: xíngli.

This is very common in Mandarin: the pronunciation of a character can depend on the word it appears in.

They are very close in meaning. Both mean here.

• 这里 is standard and widely understood everywhere.
• 这儿 is also very common, especially in northern Mandarin.

So you can say:

• 行李在这里。
• 行李在这儿。

Both mean The luggage is here.

As a learner, 这里 is a very safe form to use.

No. In this sentence, no measure word is needed.

You only need a measure word in certain situations, such as when counting or specifying one item:

• 一件行李 = one piece of luggage
• 那件行李 = that piece of luggage

But in a simple statement like The luggage is here, the noun can appear by itself:

• 行李在这里。

So this sentence is completely natural without a measure word.

Usually, no. In a basic location sentence, 是 is not normally used before 在这里.

Natural:

• 行李在这里。

Unnatural or incorrect in most basic contexts:

• 行李是在这里。

You may sometimes hear 是 in more advanced patterns for emphasis or contrast, but that is not the normal beginner structure. For a simple sentence, just use:

Subject + 在 + Place

Yes, absolutely.

If someone asks:

• 行李在哪里？ = Where is the luggage?

A natural answer is:

• 行李在这里。 = The luggage is here.

So this is a very practical sentence for real situations like airports, hotels, or travel.

这里 is made of:

• 这 = this
• 里 = inside / place / area

Together, 这里 means this place, which in natural English is here.

So in the sentence:

• 行李在这里。

you can think of it as:

• The luggage is in this place / here.

Yes. The structure stays the same:

Subject + 在 + Place

For example:

• 行李在那边。 = The luggage is over there.
• 行李在房间里。 = The luggage is in the room.
• 行李在车上。 = The luggage is in/on the car.
• 行李在桌子旁边。 = The luggage is beside the table.

So once you know 行李在这里, you can make many similar sentences by changing the place word.

。 is the standard Chinese full stop.

It works like the English period ., but it is written as a small circle.

So:

• 行李在这里。

is simply the normal written way to end a sentence in Chinese.