How to judge whether the word is plural or singular in English? Is the plural followed by the singular?

How to judge whether the word is plural or singular in English? Is the plural followed by the singular?

The plural number of nouns and singular number of verbs are usually added with S. if you do more exercises, you won't be confused. Don't memorize! There is no such thing as what follows the plural number. You should make clear the grammar, sentence structure and part of speech of words!