Interface
Our tutorial interface is divided into four parts: a top pane, which consists of three volume selection buttons and a lesson selection bar; a left pane, which contains original passage button and a sentence list; an original sentence display (OSD) and a demonstration board, which takes up most of the tutorial interface.
By selecting in the order of volume, lesson and sentence, you will be landing on the original sentence of your choice displayed first on the OSD. Once the mouse hovers over the lower left corner of the area, a button labeled “Sentence Structure” will emerge, which, upon being clicked, will present you with the demonstration board below.
As soon as the mouse moves into the upper-left corner of the demonstration board, a row of buttons appears, labeled as “Main”, “Modifier”* or “Level X”* (if there are any), “Structure”, and “Reset” respectively.
All difficult sentences will be systematically analyzed in a hierarchical manner, broken down into levels or steps. Some intricate simple sentences are analyzed in the same way as well, but such analyses for the simple sentences are intended for explanation purpose only, do not mean that the subject, verb and object have any hierarchical relationship, or belong to different levels.
Please note that the beginning of grammar analysis is lined up with the beginning of the original sentence above. Sometimes the parts of a sentence and their grammar analyses are far apart, please be careful to find out the corresponding pairs.
Tip: A careless big movement of the mouse will trigger a refresh of the demonstration board and cause the loss of the content of the sentence you are studying. To retrieve the lost content, simply click on any other sentence button first, and then return to click on the desired sentence.

* Generally, in terms of grammar, modifiers perform functions equivalent to modification structures on Level 1, such as attributive clauses and adverbial clauses, and are often interchangeable. Therefore, this tutorial refrains from rigidly distinguishing between modifiers and Level 1 structures, allowing learners to recategorize them based on their preferences.