péngyou yǐjīng guòlái le.

Not exactly. They do different jobs:

• 已经 means already
• 了 here marks a new situation / change of state, often with a sense of completion

So 朋友已经过来了 means something like The friend has already come over or The friend is here now already.

A useful pattern is:

已经 + verb phrase + 了

This is very common in Mandarin when you want to stress that something has happened by now.

过来 is a directional complement meaning come over or come here.

It is made of:

• 过 = across / over
• 来 = toward the speaker or toward the reference point

So 过来 describes movement toward this side.

In this sentence, it means the friend came over to where the speaker is, or to the place that is being treated as here in the conversation.

No. They are different uses of the same character.

In 过来, 过 is part of a directional verb: come over.

It is not the experiential aspect marker used in sentences like:

• 我去过北京。 = I have been to Beijing.

So in 朋友已经过来了, you should understand 过来 as one unit meaning come over, not as 过 plus some aspect meaning.

Because 过来 works as one verb unit here, and 了 comes after the whole verb phrase.

So:

• 过来 = the action
• 过来了 = the action has happened / the new situation has come about

You do not split it like 过了来.

In sentences with directional complements, 了 commonly comes after the full verb-complement structure:

• 走进来了
• 拿过来了
• 跑出去了

So 过来了 is the natural form.

Because 已经 is an adverb, and adverbs in Mandarin usually go before the verb phrase.

So the order is:

subject + 已经 + verb phrase + 了

Here:

• 朋友 = subject
• 已经 = adverb
• 过来 = verb phrase
• 了 = sentence-final particle / aspect-related marker

This word order is very normal in Chinese.

Yes. By itself, 朋友 can be singular or plural. Chinese nouns usually do not change form for plural the way English nouns do.

So depending on context, this could mean:

• A friend has already come over
• Friends have already come over

If you want to make it clearly plural, you could use context, a number, or something else such as:

• 一个朋友 = one friend
• 几个朋友 = several friends

In this sentence alone, the number is not specified.

Yes. 朋友来了 is a very natural sentence.

But the nuance is a little different:

• 朋友来了 = The friend came / is here
• 朋友过来了 = The friend came over (to here / to this side)
• 朋友已经过来了 = The friend has already come over

So:

• 来 focuses on coming
• 过来 adds the idea of coming over toward here
• 已经 adds already

Each extra piece adds more detail.

It is better not to think of 了 as a direct equivalent of English past tense.

In this sentence, 了 signals that a new state now holds: the friend is now here / has now come over.

Mandarin does not have a past tense system like English. Instead, it often uses particles like 了, time words, context, and aspect markers.

So here, 了 does not simply mean past. It helps show that the action has been completed and that the situation has changed.

Usually it means movement toward the speaker, but more broadly it means movement toward the reference point treated as here in the conversation.

For example, if two people are talking about an office, someone might say a friend 过来了 even if neither speaker is physically there at that exact moment, as long as that place is the conversational here.

The important contrast is:

• 来 = toward here
• 去 = away from here

So 过来 and 过去 are opposites in direction.

It is pronounced:

• péngyou

The first syllable has the 2nd tone: péng The second syllable is usually in a neutral tone: you

That is very common in Mandarin disyllabic words. So learners should not usually say a full strong tone on the second syllable here.

Similarly, 了 in this sentence is also pronounced lightly as le.