Here is my question. Can I end a sentence with the word (in)?

Here is an example of my sentence with the word (in) at the end of my sentence.

This alters the way we view lifespan development, as individuals truly never stop evolving and changing their own perceptions and ideas depending on the environment that they find themselves in.

You can.

It would be better to do two things, however:

1. Break up this too-long sentence into two sentences.

2. Write "in which they find themselves" at the end so you can avoid that preposition at the end of the sentence.

Thank you, Writeacher

Yes, you can end a sentence with the word "in." In English grammar, there are no strict rules against ending a sentence with a preposition like "in." While it was once considered nonstandard or frowned upon, this rule has been relaxed in modern usage.

If you want to ensure that your sentence is grammatically correct and flows well, you could consider rephrasing it. In this case, you could rearrange the sentence to place the preposition earlier:

"This alters the way we view lifespan development because individuals truly never stop evolving and changing their own perceptions and ideas, depending on the environment in which they find themselves."

However, the original sentence with the word "in" at the end is perfectly acceptable in modern English.