Apply the course version boundaries in notes.md; HSK tasks are transferable language practice, not a claimed HSK 3.0 mock.
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hsk2:mixed-revision:1
Complete and explain: 这件衣服____那件便宜。
Answer and reasoning
比. The pattern A比B+adjective makes a comparison.
hsk2:mixed-revision:2
Say that you have visited Beijing before but did not go there yesterday.
Answer and reasoning
我去过北京，但是昨天没去。过 marks experience; 没 negates the past event.
hsk2:mixed-revision:3
Supervised directions: tell a partner to go left, cross the bridge and stop beside the school.
Answer and reasoning
往左走，过桥，在学校旁边停下来。Teacher checks ordered actions and whether the partner reaches the intended place.