fánghào yě xiě zài fāpiào shàng.

Chinese often leaves out the subject when it is obvious from context or not important.

So 房号也写在发票上 naturally means something like:

• The room number is also written on the invoice.
• They also write the room number on the invoice.

English usually forces you to choose a subject, but Chinese often does not. Here, the important information is where the room number appears, not who writes it.

Also, Chinese often uses an active-looking verb where English might prefer a passive translation. So 写 is literally write, but in context the whole sentence is often best translated as is written.

也 means also.

In Chinese, 也 usually comes before the verb (or before the main predicate), not in the same place as English also.

So:

• 房号也写在发票上 = The room number is also written on the invoice.

The pattern is often:

• subject/topic + 也 + verb/predicate

Examples:

• 名字也写在上面。 = The name is also written on it.
• 他也去。 = He is also going.

An English speaker may want to put 也 at the end or directly next to the thing being added, but Chinese usually places it before the verb phrase.

在发票上 means on the invoice.

This structure is:

• 在 + place + 上/里/下

Here:

• 在 = at / on / in
• 发票 = invoice, receipt
• 上 = on, on the surface of

So:

• 在发票上 = on the invoice
• literally: at the invoice’s surface

Common similar examples:

• 在桌子上 = on the table
• 在纸上 = on the paper
• 在墙上 = on the wall

You usually need 上 here because the meaning is specifically on the surface of the invoice, not just at the invoice.

Literally, 写 means to write.

But in sentences like this, Chinese often uses 写 in a way that English would translate more naturally as is written or appears in writing.

So:

• 房号也写在发票上 can be understood literally as
  They also write the room number on the invoice

  but in natural English it is often better as

• The room number is also written on the invoice.

This is very common in Chinese: the verb stays simple, while English may need a passive form.

房号 means room number.

In many contexts, especially hotels, it refers to the number of a room.
房间号 also means room number and is very similar.

A rough difference:

• 房号 = shorter, common, natural
• 房间号 = a little more explicit

In hotel contexts, both can work.
For example:

• 请告诉我房号。
• 请告诉我房间号。

Both mean Please tell me the room number.

Not exactly.

发票 usually means an official invoice or tax receipt, especially in Mainland China. It is a specific kind of document used for accounting, reimbursement, or tax purposes.

English learners often think 发票 just means any receipt, but Chinese distinguishes between different kinds of receipt-like documents.

For example:

• 发票 = official invoice / tax receipt
• 收据 = receipt
• 小票 = sales slip / checkout receipt

So depending on context, 发票 may be translated as invoice or sometimes receipt, but it is more specific than the everyday English word receipt.

The given sentence has a very normal structure:

• 房号 = topic / thing being talked about
• 也 = also
• 写 = write / be written
• 在发票上 = on the invoice

So the sentence focuses on the room number and says where it is written.

You can say 在发票上也写房号, but it feels different. That version puts more emphasis on on the invoice as the place.

Compare:

• 房号也写在发票上。 = The room number is also written on the invoice.

  • focus: room number

• 在发票上也写房号。 = They also write the room number on the invoice.

  • focus: on the invoice

Both can work, but the original sentence is more natural if you are talking about what information appears.

Yes, but it usually does not need to.

You could say something like:

• 房号也被写在发票上。

This is grammatically possible, but it is less natural in many ordinary situations.

Chinese often avoids 被 unless:

• the agent matters,
• the passive meaning needs to be emphasized,
• or the sentence has a stronger affected feeling.

So the simple sentence:

• 房号也写在发票上。

is usually the better choice.

English uses passive forms very often, but Chinese often expresses the same idea without 被.

Yes, but the meaning is slightly different.

• 写在发票上 focuses on the result/location:
  be written on the invoice
• 写到发票上 often emphasizes the action of putting the writing onto it:
  write it onto the invoice

So:

• 房号也写在发票上。 = The room number is also written on the invoice.

• 把房号也写到发票上。 = Write the room number onto the invoice as well.

In your sentence, 写在发票上 is the more natural choice because it describes where the room number appears.

It depends on context. Chinese verbs do not change form for tense the way English verbs do.

So 房号也写在发票上 could mean:

• The room number is also written on the invoice.
• The room number also gets written on the invoice.
• They also write the room number on the invoice.

The exact time reference comes from context.

If you want to make it more clearly completed, you might add 了 in some situations:

• 房号也写在发票上了。 = The room number has also been written on the invoice.

Without 了, the sentence can sound more like a general statement or a plain description.