xiàbān yǐhòu wǒmen yìqǐ qù fàndiàn chīfàn ba.

下班 means to get off work or to finish work.
以后 means after.

So 下班以后 means after work, or more literally, after getting off work.

In Chinese, this kind of time expression is very common:

• 吃饭以后 = after eating
• 上课以后 = after class
• 回家以后 = after going home / after getting home

In Chinese, 以后 usually comes after the event or time it refers to.

So the pattern is:

event/time + 以后 = after event/time

Examples:

• 下班以后 = after work
• 六点以后 = after 6 o’clock
• 看完电影以后 = after finishing the movie

This is different from English, where after usually comes first.

Chinese often puts time expressions near the beginning of the sentence, before the main action.

So:

下班以后，我们一起去饭店吃饭吧。

is a very natural Chinese order:

• time: after work
• subject: we
• how/with whom: together
• main action: go to the restaurant to eat

You could also say:

我们下班以后一起去饭店吃饭吧。

That is also natural. Chinese is often flexible with time phrases as long as they come before the main verb phrase.

一起 means together, and it works like an adverb here, so it comes before the verb phrase it modifies.

So:

• 我们一起去 = we go together
• 我们一起吃饭 = we eat together
• 我们一起学习 = we study together

Chinese usually places words like 一起, 都, 也, 常常 before the main verb.

This is because of a common tone-change rule for 一.

By itself, 一 is first tone: yī.
But when it comes before another word, its tone often changes:

• before a 4th tone, it becomes yí
• before a 1st, 2nd, or 3rd tone, it becomes yì

Since 起 is qǐ (3rd tone), 一起 is pronounced yìqǐ.

This is pronunciation change, not a change in meaning.

Yes, here 一起 means together.

In this sentence, it means we will go together. Depending on context, it can also imply do something together more generally.

Examples:

• 我们一起去吧。 = Let’s go together.
• 一起吃饭。 = eat together
• 一起看电影。 = watch a movie together

So it works very much like together, but in Chinese it usually comes before the verb.

Chinese often uses this kind of verb + place + verb structure.

Here:

• 去饭店 = go to the restaurant
• 吃饭 = eat / have a meal

So:

去饭店吃饭 = go to the restaurant to eat

This is very natural in Chinese. The first verb shows the movement, and the second shows the purpose or main action.

Similar examples:

• 去学校上课 = go to school to attend class
• 去商店买东西 = go to the store to buy things
• 去朋友家聊天 = go to a friend’s house to chat

In Chinese, 去 + place already means go to + place.

So:

• 去饭店 = go to the restaurant
• 去学校 = go to school
• 去北京 = go to Beijing

You do not need a separate word equivalent to English to here.

Sometimes Chinese can also use 到:

• 到饭店去吃饭

But 去饭店吃饭 is perfectly normal and natural.

In this sentence, yes, 饭店 means restaurant.

However, learners should know that 饭店 can be a little tricky depending on region and context. In modern usage:

• 餐厅 is often the clearest word for restaurant
• 饭店 can mean restaurant, but in some contexts it can also be part of the name of a hotel

So in everyday speech, if you want the least ambiguity, 餐厅 is often a safer beginner word. But 饭店 in a sentence like 去饭店吃饭 is very naturally understood as restaurant.

吃饭 literally looks like eat rice/meal, but in modern Chinese it often simply means eat a meal or have a meal.

So:

• 吃 = eat
• 吃饭 = have a meal / eat

In many everyday situations, 吃饭 sounds more natural than just 吃, unless you are talking about eating a specific thing.

Compare:

• 我们去吃饭吧。 = Let’s go eat / Let’s go have a meal.
• 我们去吃饺子吧。 = Let’s go eat dumplings.

So 吃饭 is very common when the point is the meal itself, not a specific food.

Here, 吧 makes the sentence sound like a suggestion, invitation, or let’s...

So:

我们一起去饭店吃饭吧。
means something like:

• Let’s go to a restaurant to eat together.
• How about we go eat at a restaurant together?

Without 吧, the sentence would sound more like a plain statement:

• 我们一起去饭店吃饭。 = We are going to the restaurant to eat together.

So 吧 softens the tone and makes it friendly.

Both are possible, but they are slightly different.

• 我们 = we / us
• 咱们 = we, including you and me, often with a more inclusive, conversational feeling

Because this sentence is an invitation, many speakers might naturally say:

咱们下班以后一起去饭店吃饭吧。

This can feel a bit more like let’s you and I / let’s all of us...

But 我们 is also completely correct and natural.

Yes. 以后 and 后 can both mean after in many situations.

So these are both natural:

• 下班以后，我们一起去饭店吃饭吧。
• 下班后，我们一起去饭店吃饭吧。

以后 can sometimes sound a little fuller or slightly more conversational, while 后 is shorter and very common too. In this sentence, either works well.

It is neutral to casual and very natural in everyday conversation.

Reasons:

• 我们 and 一起 are everyday words
• 吧 gives it a conversational, friendly tone
• 去饭店吃饭 is normal spoken Chinese

If you wanted to sound more formal, you might choose different vocabulary or a different context, but for speaking to coworkers or friends, this sentence sounds very normal.

Yes. Even though 饭店 is explicitly mentioned, the sentence can feel like a natural invitation where the main idea is let’s go have dinner after work.

Chinese often expresses this in a straightforward action sequence:

• after work
• we together
• go to a restaurant
• eat
• suggestion particle

So the restaurant is part of the plan, but the overall feeling is simply a friendly invitation to eat after work.