hěnduō dàxuéshēng zhōumò zài kāfēiguǎn dǎgōng.

The structure is:

• 很多大学生 – many college students (subject)
• 周末 – on weekends (time phrase)
• 在咖啡馆 – at cafés (location phrase)
• 打工 – work part-time / do part‑time jobs (verb)

So the pattern is:

Subject + Time + Place + Verb

Literally: Many college-students weekends at cafés do-part-time-work.

In English we usually say:

Many college students work part-time at cafés on weekends.

So English often prefers Subject + Verb + Place + Time, while Chinese typically prefers Subject + Time + Place + Verb.

Chinese doesn’t use 是 nearly as often as English uses “to be.”

• 是 is mainly used to link two nouns/pronouns:
  • 他是老师。= He is a teacher.
• When you describe where someone is or what they do, you generally don’t use 是. You just use:
  • Subject + (time) + (place) + verb

So:

• 很多大学生周末在咖啡馆打工。
  Literally: Many college students weekends at cafés work-part-time.

Saying:

• ✗ 很多大学生周末是，在咖啡馆打工。
• ✗ 很多大学生周末是在咖啡馆打工。 (in neutral context)

is usually unnecessary or awkward.

是在…打工 can be used, but it adds emphasis to the location, like:

• 他们不是在图书馆，他们是在咖啡馆打工。
  They’re not working in the library; they’re working in the café (emphasis on 在咖啡馆).

Chinese usually doesn’t mark plural on nouns the way English does.

• 大学生 can mean “college student” or “college students” depending on context.
• The word 很多 (“many”) already shows it’s plural, so 大学生 doesn’t need any extra marking.

The suffix 们 is:

• Used mainly with pronouns: 我们 (we), 你们 (you all), 他们 (they)
• Sometimes with specific, known groups of people: 同学们 (you classmates), 孩子们 (the children)

But you don’t normally put 们 after a noun that already has a number or a quantity word (like 很多):

• ✗ 很多大学生们 – incorrect / very unnatural
• ✓ 很多大学生 – correct

With many nouns in Chinese you need a measure word between a number/quantity word and the noun:

• 一个学生 – one student
• 三本书 – three books
• 很多个人 – many people (with 个)

But:

1. After 很多, it’s very common and natural to omit 个 when the noun is a general category like 学生 / 人 / 问题:

   • 很多学生 – many students
   • 很多人 – many people
   • 很多问题 – many questions

2. 很多大学生 is the most natural form here.

   • 很多个大学生 is possible in some contexts, but it sounds more colloquial/emphatic and less standard, and not needed in this neutral sentence.

For learners, treat 很多大学生 as the normal, correct pattern.

Both exist, but they’re slightly different:

• 大学生 is a compound word meaning “college student” (a single vocabulary item).
• 大学的学生 literally means “students of the university.”

In most contexts they are interchangeable, but:

• 大学生 is shorter and more common as a general category.
• 大学的学生 can sound slightly more specific or descriptive, e.g. “the students of that university (as opposed to high-school students).”

In this sentence, 很多大学生… is the most natural and idiomatic way to say “many college students.”

The sentence is:

很多大学生 周末 在咖啡馆打工。

Typical Chinese order is:

Subject + Time + Place + Verb

So 周末 goes between the subject and the place phrase.

You can also move the time phrase to the very beginning for emphasis:

• 周末，很多大学生在咖啡馆打工。
  On weekends, many college students work at cafés.

Both are common and correct. Putting 周末 at the very end:

• ✗ 很多大学生在咖啡馆打工周末。

is unnatural in Chinese.

By default, 周末 in a sentence like this is general/habitual:

• 很多大学生周末在咖啡馆打工。
  = Many college students (typically) work part-time at cafés on weekends.

If you want to talk about a specific weekend, you usually add a modifier:

• 这个周末 – this weekend
• 上个周末 – last weekend
• 下个周末 – next weekend

Example:

• 很多大学生这个周末在咖啡馆打工。
  Many college students are working at cafés this weekend.

打工 (dǎgōng) usually means:

• To work a part-time, often low-wage or side job
• Very commonly used for students working outside class
• Also used for migrant workers working for an employer

Examples:

• 我在咖啡馆打工。– I work part-time in a café.
• 暑假的时候他去工厂打工。– He went to a factory to do temporary work in the summer vacation.

工作 (gōngzuò) is more general:

• To work; a job, career
• Often suggests a more formal or regular job.

You can say:

• 很多大学生周末在咖啡馆工作。

This is grammatically fine, but it may sound more like they work there as their regular job.
Using 打工 fits the idea of part-time student jobs more naturally.

在 has two common uses that learners meet early:

1. 在 + place = “at / in / on (a place)”

   • 我在学校。– I’m at school.
   • 他在家。– He’s at home.
   • 他们在咖啡馆打工。– They work at the café.

2. 在 + verb phrase = progressive “be doing”

   • 我在看书。– I’m reading (right now).
   • 他在吃饭。– He’s eating.

In this sentence:

在咖啡馆打工

在 belongs with 咖啡馆, so it is the location marker, not the progressive:

• 在咖啡馆 = at the café
• 打工 = work part-time

So the structure is: 在 + [place] + [verb], not 在 + [verb].

Yes, grammatically you can say:

• 很多大学生在周末在咖啡馆打工。

Here:

• 在周末 – during the weekend (time phrase)
• 在咖啡馆 – at the café (place phrase)

However:

• In everyday speech and writing, Chinese usually drops 在 before 周末 and just says 周末.
• So 很多大学生周末在咖啡馆打工 sounds more natural and concise.

Use:

• 周末 (no 在) for time in neutral sentences.
• 在周末 is possible but slightly heavier, and more often used when you want to contrast with other times, e.g.:
  • 平时我在学校上课，在周末在咖啡馆打工。
    On weekdays I have classes at school; on weekends I work at a café.

Yes:

• 在咖啡馆打工 – work at a café
• 在咖啡馆里打工 – work inside a café

里 means “inside.” Often:

• With buildings like 咖啡馆 / 学校 / 图书馆, adding 里 is optional:
  • 我在学校(里)。– I’m at school / in the school.
• 在咖啡馆打工 is slightly more neutral and is what you’ll hear most often.
• 在咖啡馆里打工 puts a tiny bit more focus on the inside vs. just “at” the café area, but in practice there is usually no big difference.

1. Yes–no question
   Add 吗 at the end:

   • 很多大学生周末在咖啡馆打工吗？
     Do many college students work part-time at cafés on weekends?

   You can answer:

   • 是的，很多大学生周末在咖啡馆打工。
   • 不是，很多大学生周末不在咖啡馆打工。

2. Negative sentence

   Put 不 before the verb phrase:

   • 很多大学生周末不在咖啡馆打工。
     Many college students do not work part-time at cafés on weekends.

You could also move the time to the front:

• 周末很多大学生不在咖啡馆打工。
  On weekends, many college students don’t work at cafés.