Lan sẽ đón em gái ở trường rồi đưa em ấy đến bữa tiệc.

Sẽ is a future marker. It tells you the action is expected to happen later, similar to will in English.

So Lan sẽ đón... rồi đưa... means Lan will pick up... and then take...

Vietnamese often does not have to mark tense, but sẽ is commonly used when the speaker wants to make the future meaning clear.

Here đón means to pick someone up or go meet someone when they arrive/finish and bring them along.

In this sentence, đón em gái ở trường means Lan will go to the school to pick up her younger sister.

It is more specific than just meet. It usually suggests receiving someone and accompanying them afterward.

Em gái specifically means younger sister.

• em can mean a younger sibling, a younger person, or a pronoun depending on context.
• em gái makes it clear that the younger sibling is female.
• If it were a younger brother, you would say em trai.

So em gái = younger sister.

By default, most learners will understand em gái here as Lan’s younger sister.

Vietnamese often leaves possession unstated when it is obvious from context. So instead of saying something like em gái của Lan, the sentence simply says em gái.

If needed for extra clarity, you could say Lan sẽ đón em gái của mình... or Lan sẽ đón em gái của Lan..., but that is often unnecessary.

Em ấy means something like her or that younger girl/person in this context. It refers back to em gái.

Vietnamese often avoids repeating the full noun when the referent is already clear. So:

• em gái = the younger sister
• em ấy = that younger sister / her

This sounds natural and avoids repetition.

Ấy is a word often used to point to or identify someone already known in the conversation. In this sentence, em ấy means that younger girl / her.

It is not exactly the same as an English pronoun, but in context it works a lot like her.

Compare:

• em gái = younger sister
• em ấy = that younger sister / her

So ấy helps turn em into a more specific referring expression.

Literally, ở trường means at school.

With the verb đón, Vietnamese commonly says the location where the person is being picked up. So đón em gái ở trường means pick up her younger sister at school.

In natural English, we might often say pick her up from school, but Vietnamese expresses it with the location ở trường.

So the meaning is:

• literal structure: pick up younger sister at school
• natural English meaning: pick up younger sister from school

In this sentence, rồi means then or and then. It links two actions in sequence:

1. đón em gái ở trường
2. đưa em ấy đến bữa tiệc

So the meaning is: Lan will first pick up her younger sister, then take her to the party.

Important: this is different from another common use of rồi, where it can mean already. Here it is a connector showing the next action.

Because the subject stays the same: Lan.

Vietnamese often omits repeated subjects when they are obvious. So instead of saying:

Lan sẽ đón em gái ở trường rồi Lan đưa em ấy đến bữa tiệc

it is more natural to say:

Lan sẽ đón em gái ở trường rồi đưa em ấy đến bữa tiệc.

English can do something similar: Lan will pick up her younger sister at school and then take her to the party.

Đưa means to take someone somewhere or to bring someone along to a destination, depending on perspective.

In this sentence, đưa em ấy đến bữa tiệc means take her to the party.

A useful contrast:

• đón = go get someone
• đưa = take someone somewhere

So the sentence has a natural sequence:

• first đón her
• then đưa her to the party

Đến means to, to arrive at, or to reach a place/event.

So đưa em ấy đến bữa tiệc means take her to the party.

It marks the destination. You will often see đến after motion verbs such as:

• đi đến... = go to...
• đưa ... đến... = take ... to...
• đến trường = arrive at/go to school, depending on context

Bữa tiệc means a party, a banquet, or a celebration meal/event.

• tiệc by itself can also mean party/banquet
• bữa tiệc is a very common full expression

The word bữa often relates to an occasion or meal-time event, so bữa tiệc sounds very natural for a party.

In many contexts, both đến tiệc and đến bữa tiệc may be understood, but bữa tiệc is a fuller and very common phrase.

Yes, but the nuance changes a little.

• rồi emphasizes sequence: and then
• và simply means and

So:

• Lan sẽ đón em gái ở trường rồi đưa em ấy đến bữa tiệc.
  = Lan will pick up her younger sister at school and then take her to the party.

• Lan sẽ đón em gái ở trường và đưa em ấy đến bữa tiệc.
  = Lan will pick up her younger sister at school and take her to the party.

Both are possible, but rồi is especially good when one action clearly happens after the other.

Yes. The sentence follows a very common Vietnamese pattern:

Subject + future marker + verb + object + location + then + verb + object + destination

Breaking it down:

• Lan = subject
• sẽ = future marker
• đón = verb
• em gái = object
• ở trường = location
• rồi = then
• đưa = verb
• em ấy = object
• đến bữa tiệc = destination

This kind of structure is very normal in Vietnamese.

Yes, it could, if the future meaning is clear from context.

For example:

Lan đón em gái ở trường rồi đưa em ấy đến bữa tiệc.

Depending on context, this could mean:

• a habitual action,
• a planned future action,
• or a description in a narrative style.

Adding sẽ makes the future meaning much clearer: Lan will pick up her younger sister at school and then take her to the party.