Chinese Topic-Comment & Predicate Sentences — 这本书我看过了/今天星期一

Chinese sentences often lead with the topic — what the sentence is about — and follow with a comment on it. Linguists call this a topic-comment sentence (话题句 huàtí jù) or a predicate-with-subject-as-predicate sentence (主谓谓语句 zhǔ wèi wèiyǔ jù). The fronted topic is not always the grammatical subject, which is why the pattern feels unfamiliar to English speakers.

Two classic examples: 这本书我看过了 (zhè běn shū wǒ kàn guò le) — "This book, I have already read" — and 中国人口很多 (Zhōngguó rénkǒu hěn duō) — "China, its population is large". English would say "I have read this book" and "China has a large population", but Chinese fronts the thing under discussion.

This pattern is everywhere in HSK 3–4 and everyday speech. It is also the umbrella for several smaller patterns below: patient-as-subject sentences, nominal predicates, adjectival predicates, and quantitative predicates.

The most common topic-comment type fronts the object of the verb. The patient (the thing acted on) becomes the topic, and the doer follows: 这本书我看过了 — "This book, I have read it." The object 这本书 moves to the front, and the subject 我 stays before the verb.

This is natural when the object is already known or being pointed at. 那个电影我看过了 (I have seen that movie), 这件事我知道 (I know about this matter), 晚饭我做好了 (dinner, I have made it ready).

The fronted topic often pairs with 都 or 也: 这些菜我都吃过了 (I have eaten all these dishes), 那部电影我也看过 (I have seen that movie too). 都 emphasizes "all", and 也 adds "also / too".

Chinese lets a noun or noun phrase stand directly as the predicate, with no 是 (to be) in the middle. This is the nominal predicate sentence (名词谓语句 míngcí wèiyǔ jù).

It is standard for time and dates: 今天星期一 (today is Monday), 明天国庆节 (tomorrow is National Day). For age: 我二十五岁 (I am 25). For origin or role: 他北京人 (he is a Beijing person), 我学生 (I am a student). For price: 这本书二十块 (this book is 20 yuan).

Note the difference from 是: 他北京人 states his origin as plain background, while 他是北京人 adds emphasis or correction. In many everyday cases the plain nominal predicate is more natural and less emphatic.

Adjectives in Chinese are predicate-ready: they need no 是. 他很高 (he is tall), 今天很冷 (today is cold), 这本书很有意思 (this book is interesting). This is the adjectival predicate sentence (形容词谓语句 xíngróngcí wèiyǔ jù).

The key trick: 很 often acts as a stabilizer, not as a strong "very". In 他很高, 很 makes the bare adjective sound complete — the sentence means "he is tall", not necessarily "he is very tall". Dropping it (他高) feels abrupt or contrastive.

To really mean "very", use 非常 or 特别: 他非常高 (he is very tall). In negative and comparison contexts 很 is often dropped: 他不高 (he is not tall), 我比他高 (I am taller than him).

A number or measure phrase can be the predicate, again with no verb. This is the quantitative predicate sentence (数量谓语句 shùliàng wèiyǔ jù).

It is everywhere in buying and selling: 一斤五块 (one jin is 5 yuan), 苹果三块钱一斤 (apples are 3 yuan a jin), 这件衣服一百块 (this garment is 100 yuan). For age and quantities: 我二十五岁 (I am 25), 我们班三十个人 (our class has 30 people).

The topic leads, the number phrase comments: 香蕉两块五一斤 (bananas are 2.5 yuan per jin). Notice there is no 是 and no verb — the number simply follows the topic.

Do not force 是 into nominal or adjectival predicates. Say 今天星期一, not 今天是星期一 (reserve 是 for emphasis), and 他很高, not 他是很高. The 是 is redundant and sounds translated from English.

Do not read 很 as always meaning "very". In 他很高 it is a filler that completes the adjective; use 非常/特别/真 when you truly mean "very".

Do not forget the topic is not always the subject. In 这本书我看过了 the topic is 这本书 (the object), and the subject is 我. Keeping 我看过了 after the topic preserves the topic-comment shape.

Do not overuse patient-fronting with indefinite objects. 一本书我看了 sounds odd; front the object only when it is known or specific (这本书我看过了). New, indefinite things stay after the verb: 我看了一本书.