fánshì rùzhù de kèrén, dōu yào zài dēngjìdān shàng xiě míngzi.

凡是...都... is a common pattern meaning any / every / all those who... then all of them...

In this sentence:

• 凡是入住的客人 = any guests who check in / all guests who are staying
• 都要在登记单上写名字 = must write their names on the registration form

So the pattern is:

• 凡是 + group/condition, 都 + statement about that whole group

It emphasizes that the rule applies without exception.

A rough structure is:

• Whoever fits this description, all of them must...

Here, 的 links a verb phrase to a noun, turning the verb phrase into a modifier.

• 入住 = to check in / to stay
• 客人 = guest
• 入住的客人 = guests who check in / staying guests

So 入住的 works like who are checking in or who have checked in in English.

This is very common in Chinese:

• 来的客人 = the guests who came
• 说中文的人 = people who speak Chinese
• 我买的书 = the book that I bought

Without 的, the phrase would sound incomplete or unnatural here.

Not exactly.

• 住 = to live, stay, reside
• 入住 = to move into a hotel/apartment, or to check in and begin staying there

So 入住 is more specific and more formal. It is often used in hotels, property management, and official notices.

For example:

• 我住在这家酒店。 = I am staying at this hotel.
• 我今天下午入住。 = I am checking in this afternoon.

In your sentence, 入住 fits well because it is about hotel registration.

Because in Chinese, 凡是 and 都 often work together as a set.

• 凡是 introduces the category or condition
• 都 marks that the statement applies to the whole category

So:

• 凡是入住的客人，都要...

sounds complete and natural.

If you removed 都, the sentence might still be understandable, but it would sound less standard and less polished. The pair 凡是...都... is the normal pattern.

Here 要 does not mean want to. It means must / need to / be required to.

So:

• 都要在登记单上写名字 = all must write their names on the registration form

Chinese 要 can mean different things depending on context:

• 我要喝咖啡。 = I want coffee.
• 你明天要上班。 = You have to work tomorrow.
• 客人都要登记。 = Guests must register.

In a rule or instruction, 要 usually means obligation.

在登记单上 means on the registration form.

Breakdown:

• 在 = at / in / on
• 登记单 = registration form
• 上 = on, on the surface of

So 在登记单上写名字 literally means write a name on the registration form.

Chinese often uses location words like 上, 里, 下, etc. after nouns:

• 在桌子上 = on the table
• 在纸上 = on the paper
• 在名单上 = on the list

Even though a form is not literally a flat surface in the same way as a table, Chinese still uses 上 for something written on it.

In Chinese, location phrases often come before the verb.

So the normal order is:

• 在 + place + verb

Here:

• 在登记单上写名字 = write names on the registration form

This is more natural than putting the location after the verb.

A common Chinese word-order pattern is:

• subject + modal + 在 + place + verb + object

So this sentence follows a very typical structure:

• 客人 都 要 在登记单上 写 名字

Good question. 写名字 literally means write one’s name. In this sentence, it means entering your name on the form.

• 写名字 = write your name
• 签名 = sign your name / provide a signature

These are not always the same thing.

If a form asks you to print or fill in your name, 写名字 is fine. If it specifically requires a signature, 签名 would be more exact.

So this sentence suggests writing your name on the registration form, not necessarily signing in a legal-signature sense.

Both can refer to a person’s name, but the tone is different.

• 名字 = name; common, everyday word
• 姓名 = full name; more formal, often used on forms and in official language

In a hotel or official notice, many native speakers might actually expect 姓名:

• 在登记单上写姓名

That sounds a bit more formal and administrative.

Using 名字 is still understandable and natural enough, but 姓名 would sound more official.

Normally, no.

You need 的 because 入住 is modifying 客人:

• 入住的客人 = guests who are checking in / checked-in guests

If you say 入住客人 by itself, it sounds unnatural in standard everyday Mandarin.

Chinese often requires 的 when a verb phrase modifies a noun. Compare:

• 学习中文的人 = people who study Chinese
• 工作的地方 = the place where one works

So in this sentence, 的 should stay.

凡是 is a word used to introduce a general category or condition. It often means something like:

• all
• any
• every case where
• whoever / whatever fits this condition

It does not always have one perfect English equivalent. Its meaning depends on the sentence.

Examples:

• 凡是学生，都可以参加。 = All students can participate.
• 凡是贵重物品，都要保管好。 = All valuable items must be kept safe.
• 凡是违反规定的人，都要受处罚。 = Anyone who breaks the rules will be punished.

So it is better to think of it as a generalizing word rather than trying to force one single translation every time.

Yes, in this context 客人 means guests, and because the sentence mentions 入住 and a 登记单, it clearly refers to hotel guests.

But 客人 is a broader word than just hotel guest. It can also mean:

• a guest visiting your home
• a customer in some service contexts
• a guest in a restaurant or venue

In this sentence, the surrounding words make the hotel meaning obvious.

It sounds fairly formal and practical, like something you might see:

• at a hotel front desk
• on a notice
• in written instructions
• in administrative language

A few words make it sound more formal or official:

• 凡是
• 入住
• 登记单

In casual spoken Mandarin, someone might say something simpler, such as:

• 住店的客人都要在登记单上写名字。
• 办理入住的客人都要登记名字。

Your sentence is natural, but it leans toward written or notice-style language.

Yes. You could say:

• 入住的客人都要在登记单上写名字。

This already means:

• Guests who check in must write their names on the registration form.

Adding 凡是 makes the sentence sound a little more sweeping or rule-like, as if saying:

• Any guest who checks in, without exception, must...

So 凡是 adds emphasis and a more formal, policy-like tone.

Yes, and the meaning would be very close:

• 所有入住的客人都要在登记单上写名字。 = All guests checking in must write their names on the registration form.

Difference in feel:

• 凡是入住的客人 = anyone who falls into the category of checking-in guests
• 所有入住的客人 = all the guests in that group

Both are correct. 凡是 often sounds a bit more like a rule or general principle, while 所有 is a straightforward all.

It can be a little flexible, depending on context.

In practice, 入住的客人 usually refers to guests in the category of those staying / checking in, especially in hotel-related language.

Because the sentence is a rule about registration, the intended meaning is probably:

• guests who are checking in or
• any guest staying at the hotel who falls under the check-in process

Chinese often leaves time reference less explicit than English, and the surrounding situation tells you how to understand it.

If someone wanted to be extra specific, they might say:

• 正在办理入住的客人 = guests who are currently checking in

But your sentence is perfectly normal as it is.