Linguee
This website is honestly the bomb.com. You can input almost any word/phrase/etc (even rather rare/unusual ones) and it will spit out web-searched example sentences with both the original content and the translated version. A real powerhouse of a website. I’m under the impression that the French <–> English platform is the most established.

Languages: English, French, German, Italian, Japanese, Portuguese, Russian, Spanish

PurpleCulture
Can find you a wide variety of words and sometimes short phrases as well. Gives you the pinyin of the sentence (color-coded by tones) and allows you to click on each individual word to redirect you to its dictionary if you don’t understand the character.

Languages: Mandarin Chinese

Tatoeba
You can search up example sentences contributed by users, which are in turn translated by users into multiple different languages. Probably the most versatile of these websites.

Languages: The majority of the world’s most widely-spoken languages

Forvo
Not an example sentence site, but I think this one is definitely worth throwing on here. You can search for an individual word in your target language, and native speakers post audio examples of them speaking it. Really great for getting the hang of pronunciation in general and also getting used to the way people pronounce words in the real world.

Languages: The majority of the world’s most widely-spoken languages

If you know of any other sites, it would be awesome if you could add them below!! 😊