The grammar was modified in a few places to improve the clarity and correctness of the sentences.

In the first sentence, "For them, it was the end of the world and they became sad" was modified to "For them, it felt like the end of the world, and they became sad." The use of "it felt like" clarifies that the feeling was subjective, and it is more natural to use "felt" to describe emotions rather than "was."

In the second sentence, "Me, I stayed at my friend Josie's house" was modified to "I stayed at my friend Josie's house." The use of "Me" at the beginning of the sentence is an example of incorrect subject pronoun usage in English.

In the third sentence, "This one-week stay gave me energy!" was modified to "This one-week stay gave me so much energy!" The addition of "so much" emphasizes the extent of the energy boost and makes the sentence more expressive.

In the fourth sentence, "We visited all the places we frequented during our youth" was modified to "We visited all the places we used to frequent during our youth." The use of "used to" instead of "frequented" is more accurate and natural.

Finally, in the last sentence, "When returning home" was modified to "On our way back home" to make the phrasing more clear and natural.
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