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A period is used most frequently to indicate the end of a sentence．

句号常置于一句话结束之处，可用于下列情形。

a．After declarative and imperative sentences．A declarative sentence makes a statement，and an imperative sentence is an order or a command．

在陈述句和语气舒缓的祈使句之后。

Mark Hanes is interested in learning more about Daisy Wheel printer．

Give Mark Hanes some information about Daisy Wheel printer．

b．After indirect questions．An indirect question is really a statement，because it simply rephrases a question in statement form．Use a period after indirect questions．Of course，use a question mark after a direct question．

在间接问句之后，直接问句则须用问号。

“Do you know，”Beth asked，“how to justify the margins on this particular dot matrix printer?”

Beth asked me how to justify the margins on this dot matrix．

c．After requests phrased as questions．Sometimes a request is written in question form．Use a period when such requests clearly indicate that an action is expected．Use a question mark when such requests require a“yes”or a“no”answer(as，for example，for favors)．

在一些表示请求、规劝意义的疑问句之后。

Will you please send us your check．

But:Will you be able to send us these supplies in time for our Memorial Day sale?

Do Not Use a Period

但在下列情形之下通常不用句号：

d．After numbers or letters in parentheses．

在使用了括号的数字和字母之后。

Lisa cited three reasons for the delay:(1)the recent strike，(2)the backlog in shipments during summer，and(3)the time needed to check customers'credit accounts．

e．After headings or titles that are on separate lines．

标题或题目另行书写。

f．After Roman numerals and amounts of dollars．

在罗马数字和金钱数量之后。

Norman de Groat III will be the new manager．

Ms．Tyson suggested $ 20 as a fair list price for our new computer game．

g．After abbreviations that already end in periods．

缩略词语中已有圆点。

Store hours are from 9 a．m．until 8 p．m．

h．After items in a list．

在表示列举的事物之后。

Nancy discussed three problems:

①The profit margin

②Increased competition

③Government regulation

Special Uses特殊使用

Use a period after initials，abbreviations，numbers or letters in outlines or enumeration，and a few contractions．Usage varies in placing periods after letters in abbreviations．

此外，句号一些特殊的功能也必须记忆：在姓名首字母缩写、缩略语以及提纲中的字母、数字之后，通常都必须使用句号（圆点）。缩略语中圆点的位置则可能有多种情况（现代英语中甚至多有弃而不用的现象）。

R．S．V．P．or RSVP