"all"with"all of"can be represented"All"or"All of them", but they have some slight differences in use.
1. "all"Usage:
When used as a pronoun,"all"Can be used separately, represented"All"or"All of them", followed by a noun directly.
For example: all students are required to attend the assembly(All students are required to attend the assembly.) ）
When used as an adjective,"all"It is usually placed in front of a noun and modifies the noun.
For example: All books in this library are arranged by category(All the books in this library are arranged by category.) ）
2. "all of"Usage:
all of"It is often used as an enhanced form of pronoun to reinforce the meaning of "all" or "all", and is generally followed by a noun phrase.
For example: i ate all of the pizza(I ate all the pizza.) ）
all of"It can also be used to reinforce demonstrative pronouns, emphasizing the selection of all from a whole. It is generally followed by a noun phrase or pronoun.
For example: I like all of the colors(I love all the colors.) ）
It should be noted that"all"with"all of"It is used interchangeably in many cases, but not in all cases. Sometimes,"all of"More commonly used to enhance the tone or emphasize the whole, especially in spoken and informal writing.
Here's an example of how to use the two:
all students passed the exam.(All students passed the exam.) ）
all of the students passed the exam.(All students passed the exam.) ）
she ate all the cookies.(She eats all the cookies.) ）
she ate all of the cookies.(She eats all the cookies.) ）
To sum up,"all"with"all of"can be represented"All"or"All of them", but"all"can be used alone, while"all of"It is often used to strengthen the tone or emphasize the whole.