有些名詞以 -s 結尾，看起來像復數名詞，但實際為不 可數名詞。這類名詞后接單數動詞。這些名詞很多為學科名稱 (e.g. 如 business studies, electronics, genetics, home economics, linguistics).

Linguistics is the scientific study of language.

語言學是對語言得科學研究。

Genetics is the study of genes.

遺傳學是研究基因得學科。

Home Economics is a subject aboutcooking and sewing.

家政學是一門關于烹飪和縫紉得學科。

Mathematics is her best subject at school.

數學是她在學校最擅長得學科。

Business studies is now a popular subject.

商學這門學科現在很受歡迎。

Physics is my favourite subject at school. 物理是我在學校最喜歡得科目。

Others are types of physical activity 其他為體育運動類別 (e.g. 如 aerobics, athletics, gymnastics).

I realized that athletics was great fun. 我意識到田徑運動非常有趣。

有些疾病名是不可數 得，但也以 -s 結尾 (e.g. 如 diabetes, measles, mumps, rabies, shingles).

Shingles is most common in older adults. 帶狀皰疹在年紀大些得成年人中最常見。

有些名詞既可 后接單數動詞，也可后接復數動詞，具體使用取決于其詞義 (e.g. 如 acoustics, economics, logistics,semantics, statistics).

指學科時后接單數動詞。

Economics is the study of how people choose to use resources. 經濟學是研究人們如何使用資源得學科。

Aerodynamics is a branch of dynamics. 空氣動力學是動力學得一個分支。

指某事物得某個特色或方面時后接復數動詞。

The economics are simple. (= the economic aspects, the way in which money influences something) 經濟賬容易算。| The aerodynamics of a racing car are very important. (= the aerodynamic qualities) 跑車得空氣動力性能非常重要。