上上周 (shàngshàngzhōu) - refers to the week before last week, while 上周 specifically means last week.

Think of '上' (shang4) as 'up' or 'above' and '周' (zhou1) as 'week'. Imagine a calendar where you can point 'up' to the previous week, helping you remember that '上周' refers to the week that has just passed.

'上周' is typically used in informal contexts, but it can also be used in more formal settings without issue. A common mistake is to confuse it with '下周' (next week), so it's important to pay attention to the context when discussing time. It often collocates with verbs like '发生' (happened) or '做' (did).

Although '上周' is not at a specific HSK level, it is useful for learners at HSK 2 and above. Students should focus on how to construct sentences using time-related vocabulary and practice using it in context to describe past events.

In Chinese culture, discussing time and past events is often tied to social interactions, such as asking about someone's activities in '上周' as a way to build rapport in conversations.

Learners often confuse '上周' with '下周' (next week). For example, saying '上周我要去' (I want to go last week) is incorrect; it should be '上周我去了' (I went last week).