We can use the adverb 光 before the subject or the predicate, depending on what exactly needs to be emphasized.
For example, “he praised only me” or “he just praised me, no one else”.
He only eats rice and does not eat meat
tā guāng chī mǐfàn, bù chī ròu
Only he eats rice. No one else eats rice
guāng tā chī mǐfàn, qítā rén dōu bù chī mǐfàn
To make the negation we should put the negative particle 不 before 光.
Getting good rest is not only about the sleep
shōngfèn xiūxi bùguāng shì shuō shuìmián
We also use 不光 in the structure with the meaning “not only..., but also…”. It may collocate with conjunctions such as:
而且 还 也
Sentences with this structure can have one or two subjects.
If there is one subject, it should be stated before the whole structure.
If there are two subjects, the first subject is stated right after 不光 and the second subject is stated before 还 or 也. For 而且, the subject may be stated either before or after it.
This book is not only interesting, but also very inspiring