1a. "Since my coming here, life has become more comfortable for my parents." - Grammatically correct. - Meaning: Life became easier for your parents after you arrived. - The phrase "my coming here" is formal and less common in conversational English. 1b. "Since my coming here, my parents' life has become more comfortable." - Grammatically correct. - Meaning: Same as 1a, but emphasizes (your parents’ life) specifically. 1c. "Since my coming here, life for my parents has become more comfortable." - Grammatically correct. - Meaning: Same as 1a and 1b. Slightly more natural than 1a because "life for my parents" flows better in modern English. 1d. "Since I came here, the life of my parents has become more comfortable." - Grammatically correct. - Meaning: Same as the others. However, "the life of my parents" feels overly formal. Which is the Best? The best choice for natural English would be: 1c: "Since my coming here, life for my parents has become more comfortable." It maintains clarity, avoids unnecessary possessive constructions like "my parents' life," and sounds slightly more conversational while still correct. Alternatively, for a more casual tone: "Since I came here, life for my parents has become more comfortable." Insight and Tip: - "My coming here" is a gerund phrase, which is correct but sounds more formal or old-fashioned. - For everyday speech, "Since I came here" is more common and natural. Tip: When deciding between formal and casual phrasing, think about the situation and audience. Use simpler structures ("Since I came here") for everyday contexts.

They are all good grammatical sentences. I'm a little bit uncomfortable with 1d, but it's ok. "The life" might (but might not) sound like a completed life, as if they were dead. If I were to rewrite the sentence to fit my personal preferences, I would change the subject and the verb to better express the main idea of the sentence. The main idea, as I see it, is not "becoming". Rather, it is the "comfort" that has entered the lives of your parents and that fact that it is you that has brought that comfort. To focus on that idea, you could say it like this: "My arrival here has brought comfort into the lives of my parents." The phrase "my arrival" renders the more cumbersome "since my coming here" unnecessary.

1d. Since I came here, my parents' lives have become more comfortable. The possessive form is normally expressed with an apostrophe, rather than 'of'.

Hi there. They have slightly different meanings. My parents' life is different from 'life' separated from the word parents. Life is an abstract noun that pertains to life in general, and doesn't belong to anyone...but can be applied to particular people. My parents' lives is very specific to their lives and no other. 1b. My parents' lives. 1d. See below