是個

是個

"是個" means "is a" or "is one".

In this sentence, "是個" is used to indicate the identity or characteristic of the subject "he", showing a specific trait "honest person".

他是個誠實的人。

He is an honest person.

Here, "是一個" highlights the singular instance or existence of a specific thing being discussed, "a learning opportunity".

這是一個很好的學習機會。

This is a great learning opportunity.

The phrase "一個" specifies a singular identity or instance here, expressing the speaker's aspiration toward being useful.

我希望能成為一個有用的人。

I hope to become a useful person.