The short form of "they have." Important limit: it is only used when "have" is a helper verb, building the perfect tense — They've finished; They've been to Japan; They've been waiting an hour.

The short form of "they have."是「they have」的縮寫。Important limit有個重要限制：it is only used when "have" is a helper verb, building the perfect tense只有當have是助動詞、用來構成完成式時才會這樣縮——They've finishedThey've finished（他們已經完成了）；They've been to JapanThey've been to Japan（他們去過日本）；They've been waiting an hourThey've been waiting an hour（他們已經等了一個小時）。

When "have" means to own or possess, English does not contract it in normal use: you say They have three children, not They've three children. (You may meet the second in older British books or poetry; it is not how people talk now.) Beyond that it behaves like all the "they" forms — people, animals, things, and the single person of unknown gender: Someone rang, but they've hung up.

You may meet the second in older British books or poetry你可能會在比較舊的英國書或詩裡看到後面那種說法；it is not how people talk now現在人不這樣講了。Beyond that it behaves like all the "they" forms除此之外，它的用法就跟所有they的形式一樣——people, animals, things, and the single person of unknown gender可以指人、動物、東西，也可以指性別不明的單一個人：Someone rang, but they've hung upSomeone rang, but they've hung up.（有人打來過，但他們已經掛了）。

It is the ordinary spoken choice; the full "they have" in speech usually signals emphasis or formality. Pronounced as one syllable, with a clear v sound at the end.

It is the ordinary spoken choice它是口語裡普通的選擇；the full "they have" in speech usually signals emphasis or formality口語裡如果講完整的「they have」，通常代表強調或比較正式。Pronounced as one syllable發音是一個音節，with a clear v sound at the end結尾有清楚的v音。