Hãy chào Lan.

Hãy marks the sentence as a command, suggestion, or encouragement. In Hãy chào Lan, it gives the sense of Please greet Lan or Go ahead and greet Lan.

A few useful points:

• hãy is often more common in careful, written, instructional, or slightly formal language.
• It can sound gentler or more deliberate than a bare command.
• In very casual everyday speech, Vietnamese speakers often use other patterns instead of hãy.

So grammatically it is an imperative marker.

Because Vietnamese usually puts the verb before its object.

In Hãy chào Lan:

• hãy = imperative marker
• chào = greet / say hello to
• Lan = the person being greeted

So the order is basically:

hãy + verb + object

That is why Lan comes after chào, not before it.

It can do both, depending on how it is used.

• As a standalone greeting, chào is related to hello.
• As a verb with an object, it means to greet or to say hello to someone.

In Hãy chào Lan, chào is clearly a verb, because it is followed by the person receiving the greeting: Lan.

So here it means greet Lan / say hello to Lan, not just hello by itself.

Vietnamese often leaves out the subject when it is obvious from context, especially in commands.

So Hãy chào Lan naturally means something like:

• You, greet Lan
• Please greet Lan

But the word for you is not required.

If you wanted to include it, you could say something like:

• Bạn hãy chào Lan.
• Em hãy chào Lan.

The choice depends on who you is.

Normally, no. In this sentence, Lan is understood as the object of chào, meaning the person who should be greeted.

So Hãy chào Lan means Greet Lan, not Lan, greet...

If you wanted to speak directly to Lan, Vietnamese would usually make that clearer, for example:

• Lan, hãy chào cô đi. = Lan, say hello to the teacher.

Here Lan is separated as a vocative, usually with a pause or comma.

Yes, but the nuance changes.

Without hãy, you get:

• Chào Lan.

This can be less clear, because depending on context it could be understood as:

• Say hello to Lan or
• Hello, Lan

Adding hãy makes the imperative meaning much clearer: Greet Lan.

So hãy is helpful when you want to unmistakably make it a command or instruction.

It is grammatical and clear, but it can sound a bit textbook-like or formal in everyday conversation.

In real speech, people might more often say things like:

• Chào Lan đi.
• Em chào Lan đi.
• Con chào Lan đi.

These versions can sound more natural in spoken Vietnamese, depending on the relationship between the speakers.

So hãy is correct, but it is not always the most casual choice.

Vietnamese does not use articles like the or a before personal names.

So you simply say:

• Lan
• Nam
• Mai

not the Lan or a Lan

That is completely normal. Proper names usually appear directly without an article.

The tones are important:

• hãy has the ngã tone
• chào has the huyền tone
• Lan has a level tone with no tone mark

A rough learner-friendly guide:

• hãy: starts around mid pitch and has a broken/rising quality in many accents
• chào: lower, falling tone
• Lan: fairly level

If pronunciation is a major goal, it is best to listen to native audio, because Vietnamese tones are hard to learn accurately from English-based spelling alone.

Yes. Vietnamese has several ways to express commands, requests, or encouragement, and each has a slightly different tone.

For example:

• Chào Lan đi. → encouraging, common in speech
• Nhớ chào Lan nhé. → Remember to greet Lan, okay?
• Chào Lan đi nhé. → softer and friendlier
• Bạn hãy chào Lan. → more explicit, because the subject is stated

So hãy is only one imperative pattern. It is useful, but not the only one.