suīrán jīntiān wǒ hěn máng, dànshì wǒmen háishi qù chāoshì ba.

In Chinese it’s normal and very natural to use the paired structure 虽然 … 但是/可是/不过 …. It isn’t redundant in Chinese the way it would be in English.

• Full form (very common): 虽然今天我很忙，但是我们还是去超市吧。
• You can drop the second connector in speech: 虽然今天我很忙，我们还是去超市吧。
• You can also replace 但是 with 可是/不过 with little change in meaning.

Yes. All of these are fine, with only slight emphasis differences:

• 虽然今天我很忙，但是我们还是去超市吧。 (default)
• 今天我虽然很忙，但是我们还是去超市吧。 (today is foregrounded)
• 我今天虽然很忙，但是我们还是去超市吧。 (the subject “I” is foregrounded)

Avoid putting 今天 at the very end of the clause; that sounds odd.

Not always. In sentences like 我很忙, 很 often works as a neutral linker, not strongly “very.” If you truly mean “very,” use stronger words:

• Intensifiers: 非常忙, 特别忙, 太忙了, 挺忙的
• Slight: 有点儿忙

Here 还是 conveys “still/anyway / it’s better to (after consideration).” Common uses of 还是:

• Choice in questions: 你要茶还是咖啡？
• “Still / nonetheless”: 他还是不来。
• “Had better / let’s just (decide on this option)”: 我们还是去超市吧。 (your sentence)

吧 softens the sentence into a suggestion/invitation, similar to “let’s …” or “how about …”

• With 吧: 我们还是去超市吧。 (polite suggestion)
• Without 吧: 我们还是去超市。 (sounds like a decision/statement)
• Don’t swap in 吗; 吗 makes a yes-no question. You can write 我们还是去超市吧？ (rising intonation) to gently propose and invite confirmation.

Yes:

• 可是 is very colloquial.
• 但是 is neutral to slightly formal.
• 不过 feels like “however” and is a touch softer. All work in 虽然 … (可是/但是/不过) ….

You need a motion verb. The most natural is 去.

• Standard: 去 + 地点 → 去超市
• Also common: 到 + 地点 + 去 → 到超市去 (focus on “arrive at”)
• For a quick trip, add a trip measure: 去趟超市, 去一趟超市, or soften with 去一下超市

When naming a destination, you can say 去超市 without a measure word. If you mean a specific or countable one, use the classifier 家 for shops:

• 去那家超市
• 去一家超市 (some supermarket, not a specific known one)

Yes. 我们 + 动作 + 吧 is a common way to make a first-person plural suggestion, i.e., “let’s …”

• You can even omit 我们 and still suggest: 还是去超市吧。 (context supplies “let’s”)

还是 goes before the verb phrase it modifies.

• Correct: 我们还是去超市吧。
• Incorrect: 我们去超市还是吧。
• If you say 还是我们去超市吧, it emphasizes “better it’s us who go (as opposed to others),” which adds a contrastive meaning.

Yes—the two clauses form a concessive structure and are separated by a comma in Chinese punctuation:

• 虽然 …，但是 … (comma between the clauses)