In Systemic Functional Grammar speech functions are expressed by grammatical clauses through Mood choices, and questions are typically expressed by interrogative clauses.
系统功能语法认为言语功能通过语气选择体现在合乎语法规律的小句中，其中提问主要由疑问句进行表达。
It is found that the declarative mood type takes the largest proportion, next are imperative and interrogative mood types.
研究发现，在语气类型中，陈述语气占据绝大部分数量，其次是祈使语气和疑问语气。
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