He never squander his time even when there was no work. Could you please inform me whether this sentence is correct or any grammar mistake there?

The sentence "He never squander his time even when there was no work" has a grammar mistake.

The correct sentence is: He never squandered his time even when there was no work.

Here's the correction:

* squandered - The past tense of the verb "squander" is needed because the sentence describes a repeated action in the past.

Let me know if you have any other sentences you'd like me to check!