X 是 ... 的，因为 ...
Use this when you state a claim and immediately back it up with a reason. The 是...的 wraps the claim into a confident, definitive assertion (think italics in English: this IS the case), and 因为 then opens the justification. Common in arguments, explanations, and persuasive writing where the speaker wants the claim to sound assured rather than tentative.
Structure
[X] 是 [CLAIM] 的，因为 [REASON]
... shì ... de, yīnwèi ...
How to Think About It
是...的 is not the same 是 as the linking verb 'is.' Here it acts as an emphasis frame: it confirms a property as established truth, not opinion. Dropping the 的 (他门槛低，因为...) reduces the sentence to flat reporting. Keeping it (他门槛是低的，因为...) elevates the claim to 'I am asserting this.' Then 因为 provides the grounds, and the whole structure reads as 'claim + footnote.'
Examples
这个决定是正确的，因为我们没有别的选择。
zhège juédìng shì zhèngquè de, yīnwèi wǒmen méiyǒu bié de xuǎnzé.
This decision is the right one, because we had no other choice.
他是值得信任的，因为他从来不撒谎。
tā shì zhídé xìnrèn de, yīnwèi tā cónglái bù sā huǎng.
He is worth trusting, because he has never lied.
这本书是值得读的，因为它会改变你的想法。
zhè běn shū shì zhídé dú de, yīnwèi tā huì gǎibiàn nǐ de xiǎngfǎ.
This book is worth reading, because it will change the way you think.
Common Mistake
Learners drop the 的 because it feels redundant, but in this assertive frame the 的 is what does the work — without it the sentence reads as a tentative observation instead of a confident claim. The 的 also signals that the speaker is closing the claim before opening the justification.
这个方法是有效，因为它简单。
这个方法是有效的，因为它简单。
Don't Confuse With
因为...所以...
Reason-first ordering. Use when you want the cause to lead. 是...的，因为... leads with the claim and justifies after.
之所以...是因为...
Also result-first, but more formal and more focused on the WHY (used when the reason is the news). 是...的，因为... focuses on confirming the claim itself.
...是...的 (plain emphasis)
Without 因为, this is the regular emphatic 是...的 frame (我是昨天来的). Add 因为 and you turn it into a claim-plus-justification structure.
Practice
Fill the blank: 这件事是重要____，因为它影响很多人。
Show answer
的
Fill the blank: 他是对的，____为他考虑得很周到。
Show answer
因
Arrange: 因为 / 这个项目 / 是 / 我们准备得很充分 / 的 / 会成功 / ，
Show answer
这个项目是会成功的，因为我们准备得很充分。
Translate to Chinese: This idea is doable, because the team is experienced.
Show answer
这个想法是可行的，因为团队有经验。
Write a sentence making a confident claim and justifying it.
Show answer
这次旅行是值得的，因为我学到了很多。
Hear It in Real Episodes
This pattern appears in 1 Fluentide episode: