wǒmen yìqǐ xiǎng bànfǎ ba.

Because 一起 works like an adverb here: it describes how the action is done—together.

So the structure is:

我们 + 一起 + 想办法 + 吧
we + together + think of a way + suggestion particle

In Mandarin, adverb-like words usually come before the verb they modify. That is why 一起 comes before 想.

想办法 is a very common verb-object expression meaning:

• to think of a way
• to figure out a solution
• to find a way to deal with something

Even though 想 by itself means to think, and 办法 means method / way / solution, together 想办法 often functions like one natural phrase.

So learners should try to recognize 想办法 as a common chunk, not just as two completely separate words.

Here it means think.

想 can mean different things depending on context, including:

• to think
• to want / would like
• to miss someone

In 想办法, it clearly means to think up or to think of a solution.

So this sentence is not saying we want a method. It means let’s think of a method / solution together.

吧 softens the sentence and turns it into a suggestion, like:

• let’s...
• how about...
• why don’t we...

So 我们一起想办法吧 is more natural and friendly than a blunt statement.

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

• 我们一起想办法。 = We think of a way together / We’ll think of a way together.

With 吧, it becomes:

• Let’s think of a way together.

Yes, it can sometimes be left out if the context is already clear.

For example:

• 我们一起想办法吧。 = Let’s think of a way together.
• 一起想办法吧。 = also Let’s think of a way together.

Chinese often omits subjects when they are obvious from context. But including 我们 makes the invitation feel explicit: we, not just a general suggestion.

This is because of the tone change rule for 一.

Normally, 一 is pronounced yī in isolation. But its tone changes depending on what follows:

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

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

So the written character stays 一, but the pronunciation changes.

Chinese nouns usually do not show singular/plural the way English does.

So 办法 could mean:

• a way
• ways
• a solution
• solutions

In this sentence, English usually translates it as a way or a solution, because that sounds most natural. But the Chinese itself does not force a singular/plural distinction.

Because 想办法 is already a normal verb-object structure.

• 想 = verb
• 办法 = object

So it works directly, just like many other Mandarin verb-object combinations.

You do not need 的 here.
And 来 would change the structure and meaning.

This is simply the standard way to say think of a way / figure something out.

Yes, absolutely.

想想办法 is also very common. The reduplication 想想 often makes the action sound:

• lighter
• less forceful
• more tentative
• more conversational

So:

• 我们一起想办法吧。 = Let’s think of a way together.
• 我们一起想想办法吧。 = Let’s think it over together / Let’s see if we can come up with a way.

Both are natural. The version with reduplication often sounds a little softer.

They are similar, but not always identical.

• 办法 often means way / solution / means, especially for solving a problem.
• 方法 usually means method, often in a more neutral or systematic sense.

In 想办法, 办法 is the natural choice because the phrase usually implies trying to solve a difficulty.

So 想办法 is a fixed and common expression.
You would not usually replace it with 想方法 in everyday speech.

A helpful way to see it is:

subject + adverb + verb-object phrase + sentence particle

So:

• 我们 = subject
• 一起 = adverb
• 想办法 = verb-object phrase
• 吧 = suggestion particle

This pattern is very common in Mandarin. Once you recognize it, many similar sentences become easier to understand.

It is neutral and very natural in everyday speech.

It is not slang, and it is not especially formal either. You could use it in many situations:

• with friends
• with classmates
• with coworkers
• in everyday family conversation

Because of 吧, it sounds cooperative and polite rather than commanding.