例句：The main products of the district are wool, cotton, timber and tung-oil.
The little girl likes to sing, to dance, and to act.
a and b(两个名词短语平行不用逗号)
a, b, and c
a, b, c, and d
新SAT OG-T1-Q4：Whey to Go
Yogurt manufacturers, food [Q4] scientists; and government officials are also working together to develop additional solutions for reusing whey.
A. NO CHANGE (scientists; and)
B. scientists: and
C. scientists, and
D. scientists, and,
本题中，yogurt manufacturers, food scientists与government officials是并列成分，按照我们的标点公式：a, b, and c, 正确答案为C。
例句：Tom’s sister, a pop singer, will appear at the opening ceremony tonight.
S, who/which……, VO.
新SAT OG-T3-Q41：More than One Way to Dress a Cat
The person chosen for this [Q41] task, digital artist, Eldar Zakirov painted the cats in the style traditionally used by portrait artists, in so doing [Q42] presenting the cats as noble individuals worthy of respect.
A. NO CHANGE (task, digital artist, Eldar Zakirov)
B. task, digital artist, Eldar Zakirov,
C. task digital artist Eldar Zakirov,
D. task, digital artist Eldar Zakirov,
第[Q41] 题中，主语是The person chosen for this task, 谓语动词是painted, 插入语部分是digital artist Eldar Zakirov，按照我们的标点公式：S,……, VO. 正确答案为D。
3.逗号：用于连接词FANBOYS (FANBOYS-for, and, nor, but, or, yet, so )之前
例句：He asked the question in a loud voice, but no one answered.
必记公式： SVO, for/and/nor/but/or/yet/so SVO.
SVO. However, SVO.
SVO; however, SVO.
S, however, VO.
例句：When the bell rang, the teacher dismissed the class.
(注意，如果状语从句在主句之后，逗号通常省略。例如： The teacher dismissed the class when the bell rang.)
In the ancient palace, they saw the throne where emperors used to sit.
I love the film, he loves the food. (错误)
I love the film, and he loves the food. (正确)
I love the film. He loves the food. (正确)
I love the film; he loves the food. (正确)
Few taxpayers received, the much talked-about debate.(错误)
Few taxpayers received, the much talked-about debate. (正确)
S, who/which vo VO
My grandmother, who smokes a lot is ninety. (错误)
My grandmother, who smokes a lot, is ninety. (正确)