Subject inversion is when the subject comes after the predicate. We use it when it is necessary to report about the existence of an object or some changes to an object.
In these kinds of sentences, there are usually time words or locatives that come before the predicate.
The subject can only be inverted if it is expressed with a noun.
xià yǔ le
There are pictures hanging on the wall
qiáng shàng guàzhe zhàopiàn
Object inversion is when the object comes not after but before the predicate. It is mostly used in colloquial speech.
It can be constructed with or without the 把 particle.
We use the 把 particle when we want to emphasize what happened to an object with more details or we want to focus on the result of an action.
I turned off the heater
wǒ bǎ nuǎnqì guāndiào le
He tore up the letter
tā bǎ xìn sīsuì le
Sentence without the particle “把”
Sometimes we may omit the 把 particle. If the object has an attribute in the sentence, we put it at the beginning of the sentence before the subject and without the 把 particle.
In writing it may be separated by a comma, but orally it should be separated by a pause after the object.
with an attribute
I haven't seen this movie
zhè bù diànyǐng wǒ méi kànguò le
I've seen this man before
nà ge rén wǒ shì jiànguò de
While translating these types of sentences, we must emphasize the object.