wǒmen jīnwǎn qù kǎlāOK.

The basic order is:

subject + time + verb + place/activity

So here:

• 我们 = we
• 今晚 = tonight
• 去 = go
• 卡拉OK = karaoke

A very natural Chinese pattern is:

谁 + 什么时候 + 做什么

• who + when + do what

Chinese often puts time before the main verb, earlier than English does.

In Mandarin, time words usually come before the verb.

So Chinese prefers:

• 我们今晚去卡拉OK。

rather than putting tonight at the end the way English often does:

• We’re going to karaoke tonight.

You can think of Chinese as setting the scene first:

1. who
2. when
3. what happens

That is why 今晚 appears before 去.

去 basically means to go.

In this sentence, because 今晚 already gives a future time, English naturally translates it as are going / are going to go.

Chinese verbs do not change form for tense the way English verbs do.
So 去 itself does not mean specifically present or future. The time is understood from context, especially from words like:

• 今晚 = tonight
• 明天 = tomorrow
• 下周 = next week

So:

• 我们今晚去卡拉OK。 = We’re going to karaoke tonight.

In Mandarin, 去 can directly take a destination or target of movement without needing a separate word like English to.

So Chinese says:

• 去学校 = go to school
• 去北京 = go to Beijing
• 去卡拉OK = go to karaoke

English needs to, but Chinese usually does not.

卡拉OK means karaoke. It is a Chinese borrowing based on karaoke / OK style wording, and it is very common and understandable.

A few related expressions are:

• 去卡拉OK = go to karaoke
• 唱卡拉OK = sing karaoke
• 去KTV = go to a karaoke venue/private-room karaoke place

In everyday speech, many people also say KTV, especially when talking about the place.

So this sentence is natural, though in some contexts you may also hear:

• 我们今晚去唱卡拉OK。
• 我们今晚去KTV。

Yes, it can be.

Strictly speaking, 卡拉OK is the activity, and learners sometimes expect a place word after 去. But in natural Chinese, people often use 去 + activity/place name in a loose, conversational way.

So 去卡拉OK is commonly understood as:

• go do karaoke
• go to a karaoke place

A fuller version could be:

• 我们今晚去唱卡拉OK。 = We’re going to sing karaoke tonight.
• 我们今晚去卡拉OK店。 = We’re going to a karaoke place tonight.

But the shorter version in your sentence is very normal in speech.

我们 is pronounced wǒmen.

• 我 = wǒ (3rd tone)
• 们 = men (usually neutral tone)

The second syllable 们 is normally unstressed, so it is often shown without a tone mark in pinyin.

So say it roughly like:

• wǒ-men

with the stress mainly on wǒ.

By itself, 我们 can mean either:

• we, including you
• we, not including you

Mandarin usually does not force you to mark that difference.

So the exact meaning depends on context.

For example:

• speaking to a friend: 我们今晚去卡拉OK。 may include the listener
• speaking about your group to someone else: it may exclude the listener

If needed, speakers make it clear through context or extra wording.

Yes. Both are natural.

• 今晚 = tonight
• 今天晚上 = this evening / tonight

So these are both fine:

• 我们今晚去卡拉OK。
• 我们今天晚上去卡拉OK。

今晚 is shorter and a bit more compact.
今天晚上 is slightly more explicit.

Because Mandarin does not need a verb like English are in this kind of sentence.

English says:

• We are going...

Mandarin simply uses the main verb:

• 我们今晚去...

Chinese grammar does not require a separate helping verb here. Time and context do a lot of the work.

Yes, you can, but it changes the feel a little.

• 我们今晚去卡拉OK。 = We’re going to karaoke tonight.
• 我们今晚要去卡拉OK。 = We are going to go to karaoke tonight / We plan to go tonight.

Adding 要 often makes the future intention more explicit.
Without 要, the sentence is already perfectly natural because 今晚 tells you the time.

Yes, it is natural and easy to understand.

That said, in real conversation you might also hear slightly different versions, such as:

• 我们今晚去唱卡拉OK。
• 我们今晚去KTV。
• 今晚我们去卡拉OK吧。

All of these are normal, depending on region and situation.

Your original sentence is a good, clear everyday sentence.

。 is the standard Chinese full stop.

In Chinese writing, punctuation marks are often full-width and look different from English punctuation. So:

• Chinese full stop: 。
• English period: .

Both learners and native speakers use 。 in normal Chinese text.

No. Standard Chinese writing normally does not put spaces between words.

So the sentence is normally written as:

我们今晚去卡拉OK。

The spaces in learning materials are only there to help you see the parts more clearly:

• 我们
• 今晚
• 去
• 卡拉OK

So the spaced version is for study, not normal writing.