the main reason is

USAGE SUMMARY

"the main reason is" is a perfectly acceptable phrase in written English.
You can use it when you're trying to explain why something is the case or why something happened. For example, "The main reason why I didn't attend the event is because I was feeling unwell."

✓ Grammatically correct

News & Media

Science

Formal & Business

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

The main reason is space.

The Economist

The main reason is cost.

The Economist

The main reason is Russia.

The New York Times

The main reason is bureaucracy.

The Economist

But the main reason is politics.

The New York Times

The main reason is the dollar.

The Economist

Yet the main reason is already known.

The Economist

The main reason is my mistake.

The New York Times

The main reason is the economy.

The Economist

The main reason is Palestine.

The Guardian - Opinion

The main reason is money.

The Washington Post

Expert writing Tips

Best practice

When providing an explanation, ensure that the reason you introduce using "the main reason is" is adequately supported by evidence or further details to enhance credibility and understanding.

Common error

Do not follow "the main reason is" with "because" as it creates a redundant construction. Instead, directly state the reason: "The main reason is the lack of funding", not "The main reason is because there is a lack of funding".

Linguistic Context

The phrase "the main reason is" functions as a causal connector, introducing the primary cause or explanation for a particular situation. As Ludwig AI indicates, it's a common and grammatically sound way to introduce an explanation. Many examples provided by Ludwig showcase this function across various contexts.

Expression frequency: Very common

Frequent in

News & Media

68%

Science

18%

Formal & Business

5%

Less common in

Academia

3%

Wiki

2%

Reference

1%

Ludwig's WRAP-UP

In summary, "the main reason is" serves as a straightforward and frequently used phrase to introduce the primary cause or explanation. Ludwig AI confirms its grammatical correctness, and the provided examples demonstrate its prevalence in News & Media, Science, and Formal & Business contexts. When using this phrase, avoid redundancy by not following it with "because". Consider varying your language by using similar phrases like "the primary cause is" or "the principal factor is", and always ensure your reason is well-supported with evidence.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

the primary cause is

Replaces "main" with "primary", emphasizing the most important cause.

the chief reason is

Substitutes "main" with "chief", highlighting the principal reason.

the principal factor is

Uses "principal factor" instead of "main reason", focusing on a contributing element.

the key factor is

Emphasizes that a particular factor is crucial or essential.

primarily, it's because

Offers an alternative structure emphasizing the primary cause in a slightly more informal way.

the underlying cause is

Focuses on the fundamental or less obvious reason.

above all, it's because

Highlights the most significant reason above all others.

the real reason is

Implies that other stated reasons are not genuine or complete.

the most important thing is

Shifts the focus to importance rather than causality, implying a reason through significance.

the explanation for this is

Offers a broader explanation rather than a specific reason.

FAQs

How can I use "the main reason is" in a sentence?

Use "the main reason is" to introduce the primary cause or explanation for something. For example, "The main reason is the lack of resources."

What phrases are similar to "the main reason is"?

Alternatives include "the primary cause is", "the principal factor is", or "the underlying cause is". You can also consider rephrasing to "primarily, it's because" or "the explanation for this is".

Is it grammatically correct to say "the main reason is because"?

No, it is considered redundant. The word "because" is already implied in "the main reason is". A better construction is "The main reason is [reason]".

What's the difference between "the main reason is" and "the real reason is"?

"The main reason is" simply introduces the primary cause. "The real reason is" implies that other stated reasons are not the true or complete explanation.