Chúng tôi phải xem lại kế hoạch du lịch trước khi gọi khách sạn.

Chúng tôi means we, but it usually excludes the listener.

So if I say Chúng tôi phải xem lại..., I mean my group and I, but not you.

By contrast, chúng ta usually means we, including the listener. So:

• chúng tôi = we, not you
• chúng ta = we, including you

This is a very important distinction in Vietnamese and often feels unusual to English speakers, since English we does not normally make that difference.

Phải means must, have to, or need to.

In Chúng tôi phải xem lại kế hoạch du lịch..., it shows obligation or necessity:

• Chúng tôi phải... = We have to...

It is commonly used for something necessary, required, or unavoidable.

Compare:

• Tôi phải đi. = I have to go.
• Bạn phải học. = You must study.

So here, phải tells you that reviewing the travel plan is not just optional.

Xem means to look at, to watch, or to check.

Xem lại means to review, to look at again, or to check again.

The word lại often adds the idea of again or back. So:

• xem = look at / check
• xem lại = review / check again

In this sentence, xem lại kế hoạch du lịch suggests they are not seeing the travel plan for the first time. They are going over it again before doing the next step.

This is a noun phrase:

• kế hoạch = plan
• du lịch = travel / tourism

Together, kế hoạch du lịch means travel plan.

Vietnamese often puts the main noun first and the describing noun after it:

• kế hoạch du lịch = plan + travel
• literally something like plan for travel

This is very common in Vietnamese noun phrases.

Trước khi means before.

It introduces an action that happens later. So in this sentence:

• trước khi gọi khách sạn = before calling the hotel

Structure:

• trước khi + verb phrase

Examples:

• trước khi ăn = before eating
• trước khi đi ngủ = before going to sleep
• trước khi gọi khách sạn = before calling the hotel

It works very similarly to English before + -ing or before + clause.

In Vietnamese, the subject is often left out when it is already clear from context.

So:

• Chúng tôi phải xem lại kế hoạch du lịch trước khi gọi khách sạn.

naturally means:

• We have to review the travel plan before we call the hotel.

Vietnamese does not need to repeat chúng tôi if the subject stays the same and is obvious.

A fuller version could be:

• Chúng tôi phải xem lại kế hoạch du lịch trước khi chúng tôi gọi khách sạn.

But that sounds less natural because the repeated subject is unnecessary.

Yes, it is natural, and it means call the hotel in the sense of contacting the hotel by phone.

• gọi = call
• khách sạn = hotel

So gọi khách sạn is a normal short way to say call the hotel.

If you want to be more explicit, you could also say:

• gọi điện cho khách sạn = call the hotel on the phone

That version makes the phone idea clearer, but gọi khách sạn is still perfectly understandable and natural in many contexts.

The basic order is:

• Subject + modal + verb phrase + time clause

Breaking it down:

• Chúng tôi = subject
• phải = modal verb showing obligation
• xem lại kế hoạch du lịch = main action
• trước khi gọi khách sạn = before calling the hotel

So the whole sentence follows a very typical Vietnamese pattern:

• Chúng tôi / phải / xem lại kế hoạch du lịch / trước khi gọi khách sạn.

English speakers often notice that Vietnamese word order is actually fairly straightforward in sentences like this.

Vietnamese verbs do not change form for tense the way English verbs do.

So xem, gọi, and other verbs stay the same. Time is usually understood from:

• context
• time words
• aspect markers, if present

In this sentence, there is no explicit tense marker. It could mean something like:

• We have to review the travel plan before calling the hotel
• We need to review the travel plan before we call the hotel

The exact time comes from context. The sentence itself mainly expresses necessity and sequence, not tense.

Yes. Depending on context, xem lại can mean:

• review
• check again
• look back at
• reconsider

In this sentence, review or check again is the most natural translation because it refers to looking over a travel plan before making a call.

So the meaning is not just see. It has the extra idea of going over something again.

Yes, but the meaning changes slightly.

• phải = must / have to
• cần = need to

So:

• Chúng tôi phải xem lại kế hoạch du lịch... = stronger, more like we have to
• Chúng tôi cần xem lại kế hoạch du lịch... = slightly softer, more like we need to

Both can work, but phải sounds more obligatory.

Vietnamese does not use articles like a, an, and the the way English does.

So:

• kế hoạch du lịch can mean a travel plan or the travel plan
• khách sạn can mean a hotel or the hotel

The exact meaning depends on context.

In this sentence, context probably makes it clear that they are talking about a specific plan and a specific hotel, so English may naturally translate them as the travel plan and the hotel.

A very literal breakdown would be:

• Chúng tôi = we
• phải = must / have to
• xem lại = review / look again at
• kế hoạch du lịch = travel plan
• trước khi = before
• gọi = call
• khách sạn = hotel

So, very literally:

We must review travel plan before call hotel.

Of course, natural English would be:

We have to review the travel plan before calling the hotel.