xìngkuī màikèfēng kěyǐ yòng, bùrán wǒmen bùnéng chàng kǎlāOK.

幸亏 means luckily / fortunately / thanks to the fact that....

In this sentence, 幸亏麦克风可以用 means something like:

• Luckily, the microphone worked
• It was a good thing the microphone was usable

A very common learner question is how it differs from 幸好. The two are often similar, and in many everyday sentences they can both be translated as luckily.

A useful difference:

• 幸亏 often sounds a bit more like thank goodness that..., sometimes with a feeling that a bad result was narrowly avoided.
• 幸好 is a little broader and often more neutral.

So here, 幸亏 fits well because the second half says there would have been a problem otherwise.

Putting 幸亏 at the beginning sets up the whole situation: Luckily, ...; otherwise, ...

So the sentence structure is:

• 幸亏 + good thing
• 不然 + bad result

That makes the logic very clear:

• 幸亏麦克风可以用
• 不然我们不能唱卡拉OK

In natural English, this is like:

• Luckily the microphone worked, otherwise we wouldn’t have been able to sing karaoke.

You can think of 幸亏 as a sentence-level adverbial phrase introducing the speaker’s relief.

Here, 麦克风可以用 means the microphone can be used / the microphone works / the microphone is usable.

It does not mean someone can use the microphone in the sense of permission, because there is no person as the subject. The subject is 麦克风 itself.

So:

• 麦克风可以用 = The microphone is usable / works
• not We are allowed to use the microphone

In Chinese, 可以用 can often describe an object’s condition:

• 这个电脑还可以用。 = This computer still works / is still usable.
• 这个椅子坏了，不能用。 = This chair is broken and can’t be used.

Both 可以 and 能 can sometimes relate to ability, but they are not always identical.

In this sentence, 可以用 sounds very natural for is usable / can be used.

A simple way to understand the difference:

• 可以 often suggests it is okay / possible / usable
• 能 often focuses more on ability / capability

With machines or objects, 可以用 is very common when you mean something is in usable condition.

For example:

• 这个手机还可以用。 = This phone still works / is still usable.
• 这个手机不能用了。 = This phone can’t be used anymore.

If you said 麦克风能用, it could also be understood, especially in speech, but 麦克风可以用 is very natural here.

不然 means otherwise / if not.

It introduces the bad result that would happen if the first condition were not true.

So the logic is:

• 幸亏麦克风可以用
• 不然我们不能唱卡拉OK

That means:

• Luckily the microphone worked
• otherwise we couldn’t sing karaoke

This is a very common pattern in Mandarin:

• 幸亏/还好...，不然...
• Luckily / good thing..., otherwise...

For example:

• 幸亏你提醒我，不然我就忘了。
  • Luckily you reminded me, otherwise I would have forgotten.

Great question. Literally, 不能 means cannot / be unable to. But in this sentence, because it comes after 不然, it is understood as a hypothetical result:

• 不然我们不能唱卡拉OK
• literally: otherwise we cannot sing karaoke
• natural English: otherwise we wouldn’t be able to sing karaoke

Chinese often does not mark this kind of hypothetical meaning as explicitly as English does. The word 不然 already tells you that the speaker is talking about an alternative situation, so English usually needs would.

So this is a case where the best translation is not a word-for-word one.

Mandarin does not have articles like a and the.

So 麦克风 can mean:

• a microphone
• the microphone
• microphones

The exact meaning depends on context.

Here, because everyone already knows which microphone is being discussed, English naturally uses the microphone, but Chinese just says 麦克风.

This is very normal in Mandarin. Learners often look for a direct equivalent of the, but there usually isn’t one.

Yes. 麦克风 is a transliteration of microphone.

The characters are chosen mainly for their sound, not for their literal meanings in this word.

• 麦克风
• màikèfēng

This is common in Chinese for imported words. Another example in the same sentence is 卡拉OK, from karaoke.

So this sentence contains two borrowed expressions:

• 麦克风 = microphone
• 卡拉OK = karaoke

Yes. In Mandarin, 唱 means to sing, and 唱卡拉OK is a very natural expression meaning to sing karaoke.

Chinese often uses a verb directly before an activity or entertainment form:

• 唱歌 = sing songs
• 唱卡拉OK = sing karaoke

You may also hear:

• 唱K
• 唱KTV
• 去唱卡拉OK
• 去唱K

All of these are common in different regions or styles.

So 唱卡拉OK is completely natural Mandarin.

The subject is already there: 麦克风.

So the structure is:

• 麦克风 = subject
• 可以用 = predicate

Together:

• 麦克风可以用 = The microphone is usable / works

Chinese often does not repeat pronouns if the noun is already stated clearly. Adding 它 would actually be unnecessary here.

For example:

• 这个门不能开。
  • This door won’t open.
• 电脑还能用。
  • The computer still works.

So 麦克风可以用 is complete and natural.

Yes, both substitutions are possible in many contexts.

For example:

• 幸好麦克风可以用，不然我们不能唱卡拉OK。
• 幸亏麦克风可以用，要不然我们不能唱卡拉OK。

These are all understandable and natural.

The differences are small:

• 幸亏 can sound a bit stronger, with more of a good thing that... feeling.
• 幸好 is often a little more general and common in everyday speech.
• 不然 and 要不然 both mean otherwise.
• 要不然 is often a bit more conversational.

So the original sentence is perfectly natural, but small variations are also possible.

A very useful pattern here is:

幸亏/幸好 + situation, 不然 + bad result

In this sentence:

• 幸亏麦克风可以用
• 不然我们不能唱卡拉OK

So the pattern means:

• Luckily..., otherwise...

This is a high-frequency structure in Mandarin. You can reuse it in many situations:

• 幸亏你来了，不然我一个人搞不定。

  • Luckily you came, otherwise I couldn’t have handled it alone.

• 幸好今天没下雨，不然比赛就取消了。

  • Luckily it didn’t rain today, otherwise the game would have been canceled.

It is a very practical sentence pattern for everyday conversation.