Thợ sửa chữa sẽ đến chiều mai.

A word-by-word breakdown is:

• thợ = worker, craftsman, technician
• sửa chữa = repair, fix
• thợ sửa chữa = repairman, repair technician
• sẽ = will, marks future time
• đến = come, arrive
• chiều mai = tomorrow afternoon

So the sentence structure is basically:

thợ sửa chữa + sẽ đến + chiều mai
= The repairman will come tomorrow afternoon.

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

So thợ sửa chữa can mean:

• a repairman
• the repairman
• repairmen / the repair workers

The exact meaning depends on context.

In a real-life situation, if both speakers already know which repairman they are talking about, English would usually say the repairman, but Vietnamese can simply say thợ sửa chữa.

By itself, it can be either singular or plural, depending on context.

In many cases, learners will translate it as singular:

• the repairman
• the repair technician

But Vietnamese nouns usually do not change form for singular vs. plural. If the speaker wants to make plurality clearer, they might add something like:

• các thợ sửa chữa = the repair workers / repairmen
• một người thợ sửa chữa = one repairman

So in your sentence, thợ sửa chữa is most naturally understood as the repairman or the repair technician, but the grammar itself does not force singular.

Sẽ is a future marker. It works a lot like English will.

So:

• đến = come / arrive
• sẽ đến = will come / will arrive

It tells the listener that the action happens in the future.

However, Vietnamese often relies on time expressions too. Since chiều mai already clearly means tomorrow afternoon, people can sometimes omit sẽ and still be understood:

• Thợ sửa chữa đến chiều mai

But with sẽ, the future meaning is more explicit and usually sounds clearer to learners.

Đến can mean both come and arrive, depending on context.

In this sentence, English might translate it as:

• will come tomorrow afternoon
• will arrive tomorrow afternoon

Both are reasonable.

Vietnamese often uses đến where English would choose either come or arrive based on the situation. If the person is coming to your place, English often prefers come, but đến is still the normal Vietnamese verb.

Putting the time expression at the end is very common in Vietnamese.

So this pattern is natural:

Subject + future marker + verb + time

• Thợ sửa chữa = subject
• sẽ = future marker
• đến = verb
• chiều mai = time

This is a very normal word order.

But Vietnamese is flexible, and you can also move the time expression earlier for emphasis:

• Chiều mai, thợ sửa chữa sẽ đến.

That version puts more focus on tomorrow afternoon.

No, it is not required here.

You can say:

• Thợ sửa chữa sẽ đến chiều mai.

You can also say:

• Thợ sửa chữa sẽ đến vào chiều mai.

Both are understandable, but Vietnamese often omits words like vào when the time expression is already clear. In everyday speech, the version without vào is perfectly normal.

That said, some speakers may prefer vào chiều mai because it sounds a bit fuller or more explicit.

Chiều mai means tomorrow afternoon.

It is made of:

• chiều = afternoon
• mai = tomorrow

Vietnamese often forms time expressions this way. Some related examples:

• sáng mai = tomorrow morning
• tối mai = tomorrow evening / tomorrow night
• chiều nay = this afternoon
• chiều qua = yesterday afternoon

So chiều mai is a very useful pattern to learn.

That is not the usual natural order.

The standard expression is:

• chiều mai = tomorrow afternoon

Not:

• ngày mai chiều

Vietnamese commonly places the part of the day first in this kind of expression:

• sáng mai
• chiều mai
• tối mai

So for natural Vietnamese, stick with chiều mai.

Yes, it is understandable and natural. But depending on style, speakers might also say:

• Chiều mai thợ sửa chữa sẽ đến.
• Thợ sửa chữa sẽ đến vào chiều mai.
• Chiều mai, thợ sửa chữa đến.

All of these can work.

The differences are small:

• adding vào can sound a little more explicit
• moving chiều mai to the front emphasizes the time
• omitting sẽ can sound more conversational if the future time is already obvious

So your original sentence is good, and it is a useful basic pattern.

It is a general and understandable way to say repairman or repair technician, but in real life Vietnamese often prefers a more specific job title if the type of repair is known.

For example:

• thợ điện = electrician
• thợ sửa ống nước = plumber
• thợ sửa máy lạnh = air-conditioner repair technician
• thợ sửa xe = mechanic

So thợ sửa chữa is fine as a broad phrase, but if you know what the person repairs, Vietnamese often uses a more specific term.