In the rich landscape of English grammar, expressing the purpose of an action is a crucial skill, especially in academic writing and professional communication. Two of the most common phrases used for this are "in order to" and "so as to". While they may seem similar, are there any differences in their usage and nuance? This article will provide a deep analysis, comparison, and detailed guidance so you can confidently use them correctly and effectively.

What do "So as to" and "In order to" mean?

Fundamentally, both "in order to" and "so as to" mean "for the purpose of" or simply "to". They are used to introduce a clause of purpose, answering the question "Why?" an action was performed. In most cases, especially in affirmative sentences, they are completely interchangeable without altering the sentence's meaning.

Consider the following examples:

• She woke up early in order to catch the first train.
• She woke up early so as to catch the first train.

As you can see, both sentences convey the same message: the purpose of waking up early was to catch the train. The choice between them often comes down to style or the speaker/writer's preference.

What is the structure of "So as to" and "In order to"?

Both phrases follow a very simple and consistent grammatical structure. Mastering this structure is key to using them correctly.

1. Affirmative Form

The general structure for an affirmative sentence is:

Main Clause + IN ORDER TO / SO AS TO + Base Verb (infinitive)

• Example with "in order to": We need to save money in order to buy a new house.
• Example with "so as to": He spoke clearly so as to be understood by everyone.

2. Negative Form

When you want to express the purpose of "not doing something," you simply add "not" before "to". This is a crucial grammatical point that many learners find confusing.

Main Clause + IN ORDER NOT TO / SO AS NOT TO + Base Verb (infinitive)

• Example with "in order not to": They left early in order not to get stuck in traffic.
• Example with "so as not to": Please be quiet so as not to wake the baby.

Important Note: A common mistake is misplacing "not," for example: "in order to not..." or "so as to not...". While sometimes used in informal speech, the standard and widely accepted structure in writing is "in order not to" and "so as not to".

When should you use "In order to" instead of "So as to"?

This is the core question that many English learners have. Although they are interchangeable in many contexts, there are subtle differences in formality and grammar rules that you should be aware of.

1. Popularity and Formality

"In order to" is far more common than "so as to" in both spoken and written English. If you're ever unsure which one to use, "in order to" is always the safer and more natural choice.

"So as to" is considered slightly more formal. Therefore, you are more likely to encounter it in academic texts, legal documents, or formal speeches. In everyday conversation, using "so as to" might make you sound a bit stiff.

2. Position in a Sentence: The Biggest Difference

This is the most important grammatical rule that distinguishes these two phrases: Only "in order to" can be used at the beginning of a sentence.

When you want to emphasize the purpose of an action by placing the purpose clause at the start of the sentence, you must use "in order to".

• Correct: ✅ In order to pass the exam, she studied for weeks.
• Incorrect: ❌ So as to pass the exam, she studied for weeks.

This rule makes "in order to" more flexible in sentence construction, allowing writers to create variety and emphasize meaning effectively.

How can you use "So as to" and "In order to" in the IELTS exam?

In academic tests like IELTS, using a diverse and accurate range of grammatical structures is a key factor for a high score, especially in the "Grammatical Range and Accuracy" criterion. Proficient use of "in order to" and "so as to" can help you demonstrate this ability.

In the Writing section, you can use them to link ideas logically. Instead of writing two simple sentences, you can combine them into a more sophisticated complex sentence.

• Instead of: Governments should invest in public transport. This will reduce traffic congestion.
• Write this: Governments should invest in public transport in order to reduce traffic congestion.

In the Speaking section, using these phrases helps give your answers more depth and a clearer structure, which can impress the examiner.

• Example: "I think it's important for young people to travel abroad so as to broaden their horizons and learn about different cultures."

Are there other equivalent structures for expressing purpose?

English is rich and always offers multiple ways to express the same idea. Besides "in order to" and "so as to," there are several other alternatives you should know.

1. To-infinitive

This is the simplest and most common way to show purpose, especially in informal speech. Essentially, you just drop "in order" or "so as".

• I went to the library to study.
• He is exercising every day to improve his health.

So why do we need "in order to"? Using "in order to" and "so as to" makes the purpose of the action more explicit and formal. Sometimes, using just a "to-infinitive" can be ambiguous.

2. So that + Clause

We use the structure "so that" to express purpose when the subjects of the two clauses are different, or when we want to use a modal verb (like can, could, will, or would).

Main Clause + SO THAT + Dependent Clause (S + modal verb + V)

• I gave him my phone number so that he could contact me. (The subjects are 'I' and 'he'.)
• She is studying hard so that she can get a scholarship.

Knowing these various structures for expressing purpose will help you convey your ideas more richly and accurately.

What are the common mistakes when using "So as to" and "In order to"?

To perfect your skills, let's review a few common mistakes that learners often make:

• Using a gerund (V-ing) instead of an infinitive: Always remember that "in order to" and "so as to" are followed by the base form of the verb.
  • ❌ He runs every morning in order to losing weight.
  • ✅ He runs every morning in order to lose weight.
• Incorrect word order in negative sentences: As mentioned, "not" must come immediately after "order"/"as" and before "to".
  • ❌ She tiptoed so as to don't make noise.
  • ✅ She tiptoed so as not to make noise.
• Using "So as to" at the beginning of a sentence: This is a classic grammatical error. Remember, only "in order to" has this privilege.
  • ❌ So as to get a better view, we moved to the front row.
  • ✅ In order to get a better view, we moved to the front row.

Conclusion

Understanding and correctly using "in order to" and "so as to" not only helps you avoid unnecessary grammatical errors but also significantly enhances the quality of your writing and fluency in communication. Remember these key points:

• Both mean "for the purpose of" and are followed by a base verb.
• "In order to" is more common and can start a sentence.
• "So as to" is slightly more formal and cannot start a sentence.
• The negative forms are "in order not to" and "so as not to".

Hopefully, this detailed article has answered all your questions. The best way to master these is through regular practice. Try making sentences with these structures in your daily writing and conversations!

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