The singular form of "trousers" is "trouser." However, it's not commonly used in everyday language. For example, if you were talking about a single pair of pants, you might say "I need to buy a new pair of trousers" instead of "I need to buy a new trouser."
In English, some words have irregular plural forms and "trousers" is one of them. Other examples include "sheep" (singular and plural are the same), "children" (plural doesn't follow normal English plural rules), and "deer" (doesn't change in plural form).
Additionally, as an English tutor, it's important to note that the English language has many nuances and quirks, and even native speakers face challenges when it comes to grammar rules and conventions. The best way to become proficient in any language is through consistent practice, and it's okay to make mistakes along the way.
I hope that helps! If you have any further questions, feel free to ask.
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