Used to emphasize a detail of an action that definitely happened in the past. E.g. 是公司派我来学习的 (It was my company that sent me here to study).
Expresses the order of two actions. Note: if the second clause has its own subject, '然后' usually comes before that subject (你先看，然后我再看).
Indicates two deliberate actions carried out at the same time: 一边学汉语，一边学京剧.
Uses a minimal quantity with a negative word to express absolute negation: 汉语一点儿也不难 (Chinese isn't hard at all), 一天汉语班也没上过 (haven't attended a single day of Chinese class).
Placed at the start of a sentence to state the purpose before the action, or after the verb as '是为了……' to explain the purpose.
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Stroke order for every character
The building blocks of Chinese characters
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