English declarative sentences have the special functions in communication uhich can express interrogative sentences, tmperative sentences and exclamatory sentences.
英语陈述句在交际中可表达疑问句、祈使句和感叹句等特殊功能。
It is found that during the period of observation, the child's production of BA is dominantly in imperative sentences and the number of interrogative and declarative sentences is very limited.
研究发现，在此期间，儿童所产生的含“吧”的语句多为祈使句，仅有少数的疑问句和陈述句。
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