Sentence-final particles are common in Chinese, including particles such as Mandarin le 了, ne 呢, ba 吧, ou 哦, a 啊, la 啦, ya 呀, and ma 嗎/吗, and Cantonese lo 囉 and ge 嘅.
[5] All of the sentence-final particles of Standard Chinese are unstressed and, unlike most syllables in the language, do not carry tone.
Likewise, even though sentence-final particles can usually be omitted from a sentence without making the sentence ungrammatical or changing its meaning,[1] some particles do contain information critical to the interpretation of an utterance's meaning, such as Mandarin le 了.
Some examples include: English also has some words and phrases that act somewhat like sentence final particles, but primarily only in colloquial speech.
Notice how when the main sentence is affirmative, the tag question is negative, and vice versa.