重写以下的文句子，并把用斜体显示的名词改为复数式。
D. Rewrite these sentences changing the nouns in italics into plural.
明确了复数附加成分的特征并统计其出现频率及相关句子。
Second, the passage made clear and definite the character of plural number appended element and count it's appearing frequency and related sentences.
但是，有时候不容易决定主词是单数还是复数。试选择适当的字，填妥以下的句子。
But sometimes it may not be easy to tell whether a subject is singular or plural. See if you can complete the following sentences by choosing the correct word.
以往主要在数的范畴、复数附加成分的研究中，句子成分数的一致性问题较为常见。
In the past, the numeral consistency between sentence elements was a common problem in the research of numeral category and plural number appended element.
在没有冠词的情况下，如果名词形式（指复数和单数）使用错误，有时可导致句子意思不清楚。
In the absence of an article, it can sometimes be unclear if the wrong sense (plural vs singular) has been used.
在没有冠词的情况下，如果名词形式（指复数和单数）使用错误，有时可导致句子意思不清楚。
In the absence of an article, it can sometimes be unclear if the wrong sense (plural vs singular) has been used.
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