You're already on track for a conversational style, but some slight adjustments can make the sentences sound more natural. Here are my suggestions: I much prefer watching films at the cinema than at home. Suggestion: I prefer watching films at the cinema rather than at home. (Using "rather than" flows more naturally in conversation.) We very much agree with the decision. Suggestion: We completely agree with the decision. (For a more casual tone, "completely" is often used.) I very much prefer reading physical books than electronic ones. Suggestion: I definitely prefer reading physical books over electronic ones. (Using "definitely" and "over" feels a bit more conversational.) I was very much surprised by her news. Suggestion: I was really surprised by her news. (In casual speech, "really surprised" sounds more natural.) The new by-pass was very much needed. Suggestion: The new bypass was really needed. (Dropping "very much" here makes it sound more everyday.) I had always much admired her work, and it was great to meet her. Suggestion: I’d always admired her work, and it was great to meet her. ("Much admired" is a bit formal, so just "always admired" sounds more casual.) As a child, I very much wanted to be an artist. Suggestion: As a child, I really wanted to be an artist. ("Really" works better in casual contexts here.) I would very much prefer to be remembered as kind rather than wealthy. Suggestion: I’d much rather be remembered as kind than wealthy. (This version sounds more conversational and matches the tone of your final sentence.) I'd much rather be remembered as kind than rich. This sentence is perfect for casual conversation!

There are many different types of casual conversation, because there are many different personalities and many different situations. For example, some people like to sound smart even in casual conversation (for sake of argument, let's call this "semi formal" here), and some people like to sound humble even in hyper formal contexts. Since there are so many options depending on what you're really looking for, I'll focus on the first sentence... I much prefer watching films at the cinema rather than at home. (This can be formal or semi-formal) I much prefer watching films at the cinema instead of at home. (This is semi-formal, and a bit less classy than the previous option) I prefer watching films at the cinema much more than at home. (This is semi-formal, and a bit less formal than the previous options) I like watching films at the cinema much more than at home. (This is truly casual, informal, basic language - not trying to sound sophisticated at all, but is no less grammatically valid and is no less charismatic than the previous options)

Here are some suggestions to make these sentences more casual and conversational: * I much prefer watching films at the cinema than at home.
→ "I prefer watching films at the cinema rather than at home."
(Dropping "much" keeps it casual, and "rather than" flows more smoothly in conversation.) * We very much agree with the decision.
→ "We totally agree with the decision."
(Using "totally" sounds more casual and natural.) * I very much prefer reading physical books than electronic ones.
→ "I definitely prefer reading physical books over e-books."
(Swapping "very much" for "definitely" makes it more conversational.) * I was very much surprised by her news.
→ "I was really surprised by her news."
(Using "really" instead of "very much" is more common in everyday speech.) * The new by-pass was very much needed.
→ "The new by-pass was definitely needed."
(This keeps the sentence casual and to the point.) * I had always much admired her work, and it was great to meet her.
→ "I’ve always really admired her work, and it was great to meet her."
("Really" is a more conversational replacement for "much.") * As a child, I very much wanted to be an artist.
→ "As a kid, I really wanted to be an artist."
("Really" keeps it natural, and "kid" is more casual than "child.") * I would very much prefer to be remembered as kind rather than wealthy.
→ "I’d much rather be remembered as kind than wealthy."
(This is already quite casual, but I've reworded for simplicity.) * I'd much rather be remembered as kind than rich.
→ This one is already perfect for a casual tone! These tweaks make the sentences feel more conversational without changing the overall meaning. Let me know if this helps!