Pleasant, chart, separate, sheet, singular nouns, plural nouns.

令人愉快的，图表，分开，一张，单数名词，复数名词。

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Singular nouns are used only in the singular, always with a determiner.

单数名词只有单数形式，总是与限定词连用。

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Actor names are usually singular nouns such as Grade Administrator, Customer, and Payment Processor.

参与者名称通常是单数名词，譬如，年级管理员、客户以及支付出纳员。

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Also, current singular versus plural with nouns and verbs.

然后是名词和一般现在时动词的单复数。

韩国人经常犯的失误 - SpeakingMax英语口语达人

Plurals outperformed singular keyword nouns.

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