Shows the direction of an action: '来' for movement toward the speaker, '去' for movement away from the speaker.
When the object is a place word (家, 屋, 楼, 书店), it must come before '来/去': 进屋来, 上楼去, 回家去.
Condition and consequence: '要是' states the hypothesis, and '就' before the predicate of the second clause gives the judgment or suggestion.
The object of the first verb (请/叫/让) is also the subject of the second action: 老师让我们预习 (The teacher had us prepare the lesson).
The standard polite phrase when you're late or have kept someone waiting.
Used at the end of a sentence to check a guess you're not completely sure of.
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The building blocks of Chinese characters
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