Base sth upon sth Meaning / Examples / How to Use

What Does “Base sth upon sth” Mean?

“Base sth upon sth” means to use one thing as the foundation or reason for another. It often refers to making decisions, opinions, or actions rely on certain facts or ideas.

Introduction

The phrase “base sth upon sth” is common in English and means to build or rely on something using a particular fact, idea, or evidence. Understanding the base sth upon sth meaning helps learners express how something depends on or is connected to another thing. For example, a scientist might base a theory upon research findings. This phrase is useful when explaining reasons, causes, or sources of information. It is often used in formal and informal contexts, making it important for learners to know how to use it correctly. This guide will explain its meaning, grammar, examples, and common mistakes to help you use it naturally.

Quick Info Box

• Phrasal verb: base something upon something
• Type: Transitive
• Level: B2–C1
• Short meaning: To use one thing as the foundation for another

Structure (Grammar Rules)

“Base sth upon sth” is a transitive phrasal verb. It is inseparable, meaning you cannot place the object between “base” and “upon.”

Pattern:

• Subject + base + something + upon + something
• Example: They base their decision upon the latest data.

How to Use “Base sth upon sth”?

Use “base sth upon sth” when you want to show that one thing depends on or is built on another. It is commonly used in academic writing, reports, and formal speech. Replace “sth” with the specific things you are talking about, such as ideas, decisions, or opinions.

Remember to keep “upon” after the first object. You can also use “on” instead of “upon” in everyday English, but “upon” sounds more formal.

Examples

• The judge based her verdict upon the evidence presented in court.
• We should base our plans upon the feedback from customers.
• His theory is based upon years of scientific research.
• The company bases its policies upon customer satisfaction.
• They based the report upon recent market trends.

Here are some examples of base sth upon sth in a sentence to help you understand its use.

Common Mistakes

• Incorrect: They base upon the data their decision.
  Correct: They base their decision upon the data.
• Incorrect: We base the results on upon the facts.
  Correct: We base the results upon the facts.
• Incorrect: She bases upon the report her opinion.
  Correct: She bases her opinion upon the report.

Differences / Synonyms

Similar phrases include “base sth on sth” and “found sth on sth.” The difference is mainly in formality. “Base sth upon sth” is more formal than “base sth on sth.” Both mean the same and can often be used interchangeably.

For example:

• We base our conclusions on facts. (Informal)
• We base our conclusions upon facts. (Formal)

“Found sth on sth” is often used when talking about starting or establishing something rather than simply relying on it.

Common Collocations

• Base a decision upon
• Base an opinion upon
• Base a theory upon
• Base a conclusion upon
• Base a strategy upon

Related Phrasal Verbs

Here are related phrasal verbs of base sth upon sth:

• Base Sth On Sth

Real-life Dialogue

Anna: How did they decide on the new schedule?

Ben: They based it upon the availability of the team members.

Anna: That makes sense. It’s important to consider everyone’s time.

Practice

Fill in the blanks with the correct form of “base sth upon sth”:

1. The scientists __________ their new theory __________ recent experiments.
2. Our marketing plan is __________ customer feedback.
3. The author __________ her story __________ real events.

FAQs

• Q: Can I use “base sth on sth” instead of “base sth upon sth”?
  A: Yes, “base sth on sth” is more common in casual English, while “upon” is more formal.
• Q: Is “base sth upon sth” separable?
  A: No, it is inseparable. The object must come before “upon.”
• Q: Can I use “base sth upon” in spoken English?
  A: Yes, but “base sth on” is more common in conversation.
• Q: What does “sth” mean in “base sth upon sth”?
  A: “Sth” stands for “something,” meaning any object or idea.