1. 主語是一個(gè)單數(shù)普通名詞、人稱代名詞或數(shù)字,述語動(dòng)詞要用單數(shù)形式。
Tom studies hard.
湯姆學(xué)習(xí)用功。
studies是第三人稱單數(shù)動(dòng)詞。

I am hungry, she is also hungry.
我餓了,她也餓了。
am是第一人稱單數(shù)動(dòng)詞,is是第三人稱單數(shù)動(dòng)詞。

Six is greater than five.
六比五大。
數(shù)字six后接單數(shù)動(dòng)詞。

2. 主語是兩個(gè)或兩個(gè)以上的單數(shù)名詞且共同表示一個(gè)概念,或兩者已固定在一起搭配時(shí),述語動(dòng)詞用單數(shù)形式。
The mother and servant is preparing breakfast for you.
媽媽兼仆人正在給你們準(zhǔn)備早餐。

The writer and professor has won the prize.
作家兼教授贏得了獎(jiǎng)勵(lì)。

3. 當(dāng)兩個(gè)或兩個(gè)以上單數(shù)主語由and連接,并用each,every,no等字修飾時(shí),主語在意義上可能是復(fù)數(shù),但述語動(dòng)詞必須用單數(shù)形式。
No boy and girl likes the new teacher.
沒有一個(gè)男生和女生喜歡這位新老師。

Each man and woman has their own hobbies.
每一個(gè)男人和女人都有自己的愛好。

4. 不定詞、動(dòng)名詞、名詞片語或名詞子句當(dāng)主語時(shí)被看作單數(shù),述語動(dòng)詞用單數(shù)形式。
Yeah. Drawing is my cup of tea.
對(duì)。畫畫我拿手。

Swimming is my favorite sport.
游泳是我最喜愛的運(yùn)動(dòng)。

Who did the work is unknown.
不知道是誰做的這件工作。

5. 一些單數(shù)名詞或片語如the United Nations, the United States, news, mathematics, physics等,雖然字尾為s,但述語動(dòng)詞必須用單數(shù)形式。
The news that he will come is a good one.
他要來的消息是個(gè)好消息。

6.主語是不定代名詞anyone, anybody, anything, someone, somebody, something, no one, nobody, nothing等時(shí),述語動(dòng)詞用單數(shù)。
Is there anything for him?
有給他的東西嗎?

Nobody likes it.
沒有人喜歡它。

7. 主語是一個(gè)不可數(shù)名詞,述語動(dòng)詞一般要用單數(shù)形式。
Music is his favorite topic.
音樂是他最喜歡的話題。

8.主語是兩個(gè)或多個(gè)不可數(shù)名詞,但已固定搭配在一起時(shí),述語動(dòng)詞要用單數(shù)形式。
Bread and milk is wholesome breakfast.
面包和牛奶是有益于健康的早餐。

9. 當(dāng)復(fù)數(shù)名詞表示數(shù)量的單一概念時(shí),述語動(dòng)詞用單數(shù)形式。
365 days is a year.
365天是一年。

Ten dollars is quite enough.
十美元就足夠了。