Ứng viên biết rằng công việc cần kỹ năng giao tiếp.

Ứng viên means candidate or applicant. In this sentence, it most naturally means a job applicant.

Yes, it is a fairly formal word, often used in:

• job hiring
• admissions
• elections
• official announcements

A less formal job-related expression is người xin việc, but ứng viên is the standard formal choice.

Here biết means to know, to be aware, or to understand a fact.

It does not mean know how to in this sentence.

Compare:

• biết rằng... = know that...
• biết làm gì = know how to do something

So here, the candidate is aware of a fact: the job requires communication skills.

Rằng introduces a clause and works a lot like English that.

So:

• biết rằng công việc cần kỹ năng giao tiếp means
• know that the job requires communication skills

It is common in more careful, formal, or written Vietnamese.

Yes. Very often, Vietnamese leaves it out.

So this is also natural:

• Ứng viên biết công việc cần kỹ năng giao tiếp.

The meaning stays the same. Using rằng just makes the sentence slightly more explicit and a bit more formal.

Yes. Biết là is very common in everyday speech.

Roughly:

• biết rằng = more formal or written
• biết là = more conversational
• biết
  • clause with nothing in between = also common

All of these can be correct depending on style.

Vietnamese usually puts the main noun first and the modifier after it.

Here:

• kỹ năng = skill / skills
• giao tiếp = communication

So kỹ năng giao tiếp literally looks like skills communication, but it means communication skills.

That head-first pattern is very common in Vietnamese.

Vietnamese nouns usually do not show singular vs. plural clearly unless the speaker adds something to mark it.

So kỹ năng giao tiếp can mean:

• communication skill or
• communication skills

In English, communication skills is often the most natural translation, but Vietnamese itself is not forcing singular or plural here.

Vietnamese does not use articles like English a/an/the.

So công việc can mean:

• a job
• the job
• sometimes work/job-related work

The exact meaning depends on context. In this sentence, it is most naturally understood as the job or the position being discussed.

Grammatically, công việc is the subject of that clause, so the literal meaning is:

• the job requires communication skills

In natural English, that usually implies that the person doing the job needs those skills.

If you want to say directly that the applicant needs them, Vietnamese would more clearly say:

• Ứng viên cần có kỹ năng giao tiếp.

So the original sentence focuses on the requirement of the job, not directly on the applicant.

Cần means need or require.

In this sentence, it is the main verb of the second clause:

• công việc = the job
• cần = requires
• kỹ năng giao tiếp = communication skills

So the structure is:

• Subject + verb + object/complement

Very straightforward:

• công việc cần kỹ năng giao tiếp

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

So biết and cần are not marked as present, past, or future by verb endings. The sentence is understood as present or generally true from context.

That is very normal in Vietnamese.

No. Ứng viên is a general word for candidate/applicant.

It can be used for:

• job applicants
• school applicants
• political candidates
• competition candidates

In this sentence, because of công việc, it clearly refers to a job candidate.

It sounds neutral to fairly formal.

That is mainly because of:

• ứng viên instead of a more casual phrase
• rằng, which is slightly more formal than just leaving it out

So this sentence would fit well in:

• HR materials
• written explanations
• formal conversation
• interview-related contexts

A more conversational version would be:

• Ứng viên biết là công việc cần kỹ năng giao tiếp.

A rough pronunciation guide:

• ứng viên: pay attention to the tone on ứng
• rằng: the tone is low/falling
• kỹ năng: kỹ has a marked tone that learners often find tricky
• giao tiếp: tiếp has a rising tone

For learners, the most important habit is to learn each new Vietnamese word together with its tone marks, because tones are part of the word, not an extra detail.