You use conditional clauses to talk about a possible situation and its results.
条件从句用以表示某种可能的情形及结果。
The auxiliary forms of need are used primarily in present-tense questions, negations, and conditional clauses.
Need的助动词形式主要用于现在时态的疑问句、否定句和条件句中。
Formal words are used. The language accuracy is required. Active voice, present tense, direct expression and conditional clauses are more frequently used.
用词多数比较正式，用语力求准确，多用主动语态、现在时态、直接表达方式和条件句等。
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