Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Very well done

If you are studying Chinese then you really need a grammar book as a companion to your other course materials. This will serve as a good reference which can be referred to when needed. The fact that the second half of the book focuses on functional (i.e. situational) grammar makes it easy to find the relevant grammar pattern. I won't go into too many details - you can read that in the review(s) below. I still have some grammar questions that the book doesn't answer but it is the best I have found so far. One area where the book is weak is on directional complements which can be unnatural for the western learner. Good luck on your learning!!