What is the usage and meaning of as, and what is the usage of as?

1. When as is used as a conjunction, it can be used to indicate time, which is translated as "just..."When; With...; Side....Side....", leading the temporal adverbial clause.

The main sentence can be either an active sentence or a passive sentence.

2. When the actions of two subjects occur at the same time, the predicate verb of the main clause and the subordinate clause.

It can be used in the continuous tense or in the general tense, regardless of the length of the action; When the time interval between two things happening is very short or even no time gap, both the main clause and the clause are in the simple past tense.

3. When the action of the main clause occurs in the process of the action of the clause, both the main clause and the clause can be in the simple past tense, or they can be used in the continuous tense in the clause. When the completion time of the two actions is exactly the same, the main and subordinate clauses connected by as can also be completed in the past.

Word usage of as:

adv.(adverb).

1. As is mainly used as an adverb to show comparison, which means "like....The same; Like". It can be used alone, but more often in as....In the AS structure, the first as is an adverb, followed by an adjective or adverb, or other components, and before AS there can be an adverbial.

The second as can be either a preposition or a conjunction. As when used as an adverb, it can also refer to things happening in the same way which means 'and.'The same;

2、as...The as structure is mostly used in the affirmative form and occasionally in the negative form as well. The negative expression that expresses the same meaning is often used so....

The structure is mostly used in colloquial language when used in negative sentences, focusing on "like...".The same; so...The as structure is mostly used in written language, with an emphasis on "like....That's it".

3、as...The as structure indicates a peer comparison, and the adjectives or adverbs after the first as cannot be compared, they must be primary, and the object of comparison must also be of the same kind.

4、as...When the as structure indicates quantity or degree, it can be used for the "as much+" or "as many+(countable plural +) as" structure.

5. Modify as....Common words in the AS structure are nearly, almost, just, exactly, half, quite, adjectives that indicate multiples or times, "numerals + times", etc. These modifiers are placed in as....

AS structure.

6. Use as....In the as construction, if the noun after the first as is a singular countable noun with an adjective modification, "as + adj." should be used+ a/an+ n.

Structure, i.e., the indefinite article should be located between the adjective and the noun. The noun or pronoun after the second as has different cases and different meanings.

7、as...In the as structure, when the latter as is used as a conjunction, the leading clause is often an omitted sentence, and the verb in the subordinate clause can be omitted to strengthen the meaning of the main clause. Conversely, repeating the verb in the clause can emphasize the meaning of the clause.