What Are Advanced ‘As’ Phrases?

‘As’ is one of the most flexible words in English. At a C1 level, you will encounter ‘as’ in more complex structures and idiomatic expressions.

We will focus on its use to introduce clauses that comment on the main sentence, describe a role, or show simultaneous actions. These uses are key for advanced communication.

How Do We Use 'As' to Introduce Common Knowledge or a Shared View?

One advanced use of 'as' is to introduce a clause that refers to something that is generally known, has been previously mentioned, or is a common observation. This helps to set context or provide a source for your statement.

• It often appears at the beginning of a sentence.
• It connects your current statement to a shared understanding or a known fact.
• This usage adds a sophisticated touch to your writing and speaking.

Common patterns include As + subject + verb または As + passive verb.

• As you know: Refers to information the listener/reader already possesses.
• As I mentioned earlier: Refers to something you said before.
• As can be seen / As is often the case: Refers to a general observation or fact.
• As my professor points out: Refers to a specific source of information.

When Does 'As' Show Role or Function?

When 'as' is used as a preposition, it means 'in the capacity of' or 'functioning as'. It describes the job, role, or purpose of a person or thing.

• It answers the question 'What role does someone/something play?'
• This use is crucial for distinguishing 'as' from 'like'.

How Does 'As' Indicate Simultaneous Actions?

'As' can also function as a conjunction to show that two actions happen at the same time. It is similar to 'while' but can sometimes imply a more continuous or background action.

• It often connects two clauses, one describing the main action and the other describing a simultaneous action.
• It is commonly used with continuous tenses (was/were + -ing).

What Are Some Common Idiomatic Expressions with 'As'?

At a C1 level, you should be familiar with several idiomatic phrases that use 'as'. These expressions add naturalness and fluency to your English.

• As a matter of fact: Used to introduce a surprising or contrary fact.
• As far as I'm concerned: Expresses your personal opinion.
• As it were: Used to qualify a statement, suggesting it is not entirely accurate or is a metaphor.
• As usual: Indicates something is happening in the normal or expected way.
• As soon as: Means 'immediately after'.

例

• As you can imagine, the project became quite complicated.
• As my mother always says, 'It's important to get rid of clutter.'
• As is well known, climate change poses a significant global threat.
• She works as a freelance journalist, covering international news.
• He used the old car as a source of spare parts.
• As I was walking through the park, I got blown away by the beautiful sunset.
• The children got accustomed to the new school as the weeks went by.
• As a matter of fact, I've already finished the report.
• As far as I'm concerned, the decision was fair.

練習

スペイン語話者がよく犯す間違い

Spanish speakers often confuse 'as' with 'like' because the Spanish word 'como' can translate to both. It's crucial to understand the distinction:

• 'As' for Role/Function vs. 'Like' for Similarity:
  - Correct: She works as a doctor. (She *is* a doctor.)
  - Incorrect: She works like a doctor. (This implies she *behaves* like a doctor, but is not one, or works in a similar way to a doctor.)
  - Correct: He looks like his brother. (They are similar in appearance.)
  - Incorrect: He looks as his brother.
• 'As' for Simultaneous Actions vs. 'When/While':
  - While 'as', 'when', and 'while' can all indicate simultaneous actions, 'as' often suggests one action happening in the background of another, or a cause-effect relationship. 'When' can be more specific about a point in time, and 'while' emphasizes duration.
  - Correct: As I was leaving, the phone rang. (The phone rang *during* my departure.)
  - Correct: When I left, the phone rang. (The phone rang *at the moment* I left.)

よくある質問

What is the main difference between 'as' and 'like'?

The main difference is that 'as' describes a role, function, or manner (He works as a teacher), while 'like' describes similarity or comparison (He sings like a bird). 'Like' is also used to introduce examples (I enjoy fruits, like apples).

Can 'as' always be replaced by 'because'?

No, 'as' can mean 'because' or 'since' in some contexts (As it was raining, we stayed inside). However, it cannot be replaced by 'because' when it describes a role (He works as a manager), indicates simultaneous actions (As I was eating, the phone rang), or introduces a known fact (As you know, it's a difficult situation).

Is 'as' formal or informal?

The word 'as' itself is neutral. However, many advanced 'as' phrases, especially those introducing common knowledge or observations (As can be seen, As is often the case), are more common in formal, academic, or professional contexts. Its use for role (as a doctor) is standard in all registers.

How might 'as' phrases appear in a C1 English exam?

'As' phrases might appear in various C1 exam tasks. For example, in a Use of English section, you might need to complete sentences with the correct 'as' phrase to show cause, manner, or role. In writing tasks, using advanced 'as' clauses can help you achieve higher marks for cohesion and sophisticated expression, for instance, when introducing a commonly held belief or referring to previous points in your essay.