英文作文題目何時用大寫

其實無乜 RULES，可以全部字，或主要字，如名詞，動詞，形用詞，代名詞，而 ARTICLES， PREPOSITIONS ， CONJUNCTIONS 等便不需。


Headings and publication titles

In English-language publications, different conventions are used for capitalizing words in publication titles and headlines, including chapter and section headings. The exact rules differ between individual house styles. The main examples are:

THE VITAMINS ARE IN MY FRESH BRUSSELS SPROUTS
all-uppercase letters
The Vitamins Are In My Fresh Brussels Sprouts
capitalization of all words, regardless of the part of speech
The Vitamins Are in My Fresh Brussels Sprouts
capitalization of all words, except for internal articles, prepositions and conjunctions
The Vitamins are in My Fresh Brussels Sprouts
capitalization of all words, except for internal articles, prepositions, conjunctions and forms of to be
The Vitamins are in my Fresh Brussels Sprouts
capitalization of all words, except for internal closed-class words
The Vitamins are in my fresh Brussels Sprouts
capitalization of all nouns
The vitamins are in my fresh Brussels sprouts
sentence-style capitalization (sentence case), only the first word and proper nouns are capitalized
the vitamins are in my fresh Brussels sprouts
capitalization of proper nouns only
the vitamins are in my fresh brussels sprouts
all-lowercase letters

Among U.S. publishers, it is a common typographic practice to capitalize additional words in titles. This is an old form of emphasis, similar to the more modern practice of using a larger or boldface font for titles. Most capitalize all words except for internal closed-class words, or internal articles, prepositions and conjunctions. Some capitalize longer prepositions such as "between", but not shorter ones. Some capitalize only nouns, others capitalize all words.

The convention followed by many British publishers (particularly scientific publishers, like Nature and New Scientist, and newspapers, like The Guardian and The Times) is the same used in other languages (e.g. French), namely to use sentence-style capitalization in titles and headlines, where capitalization follows the same rules that apply for sentences. This is also widely used in the U.S., especially in bibliographic references and library catalogues. This convention is also used in the International Organization for Standardization and Wikipedia house styles. The Oxford Manual of Style suggests capitalising "the first word and all nouns, pronouns, adjectives, verbs and adverbs, but generally not articles, conjunctions and short prepositions."[2]

Book titles are often emphasized on cover and title pages through the use of all-uppercase letters. Both British and U.S. publishers use this convention.

In creative typography, such as music record covers and other artistic material, all styles are commonly encountered, including all-lowercase letters.

http://en.wikipedia.org/wiki/Capitalization

英文信的標題大小寫同上。要加 RE： ， 但不一定要 UNDERLINE。下面的例子是 BOLD 左 D 字，無 UNERLINE。http://ezinearticles.com/?Writing-Business-Letters---Tutorial-2:-Parts-of-a-Business-Letter&id=80154

2006-11-15 14:25:57 補充：
你看真 D，是例子，和引文，講明出處，不是我老作。