The short form of "they will." It is what people actually say — in speech, the full "they will" is rare and sounds slightly heavy or emphatic, so "they'll" is the normal, unmarked choice: They'll be here at six.

"they will"的 The short form縮寫。 It is what people actually say這才是大家實際說出口的—— in speech在口語裡， the full "they will"完整的 "they will" is rare很少見， and sounds slightly heavy or emphatic而且聽起來有點重、有點強調， so所以 "they'll"才是 the normal, unmarked choice平常、不帶特別意味的選擇： They'll be here at six.他們六點會到。

Because "they" covers people, animals, and things, so does this: They'll arrive tomorrow (the guests); They'll break if you drop them (the glasses). It also does the modern singular use — one person whose gender you do not know or do not need to state: If anyone calls, they'll leave a message.

Because因為 "they" covers涵蓋 people, animals, and things人、動物和東西， so does this所以這個縮寫也一樣： They'll arrive tomorrow他們明天會到 (the guests指客人們)； They'll break if you drop them你摔了它們就會破 (the glasses指玻璃杯)。 It also does它也能做 the modern singular use現代的單數用法—— gender you do not know or do not need to state性別不知道、或不需要說出來的 one person某一個人： If anyone calls, they'll leave a message.要是有人打來，他會留言。

In writing, it belongs to friendly, everyday registers — emails, messages, blog posts, dialogue. Formal writing (an academic paper, a legal notice, a business report) usually spells out "they will." One useful thing: the apostrophe stands exactly for the missing letters (wi-), and the sound collapses too — it is one syllable, roughly "THAYL," not two.

In writing在書面上， it belongs to它屬於 friendly, everyday registers親切、日常的語域—— emails, messages, blog posts, dialogue電子郵件、訊息、部落格文、對話。 Formal writing正式文章 (an academic paper, a legal notice, a business report學術論文、法律通知、商業報告) usually通常 spells out會完整拼出 "they will."。 One useful thing一件好用的事： the apostrophe那個撇號 stands exactly for剛好就代表 the missing letters少掉的字母 (wi-)， and the sound collapses too聲音也跟著縮起來—— it is one syllable它是一個音節， roughly大概像 "THAYL,"， not two不是兩個。