#if you want i can like...share one of my VSQx files where flower sings so you can Study It. but i'm not an expert like i said so

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how do u make flower sing in english???

step one: try your best :')

step two: ok in all seriousness you can make japanese vocaloids sing in english if you are familiar with japanese pronounciation and use phonemes well enough. i'm not very good at explaining but i will try to tell some things i do to have flower sing the best english i can manage (she's the only jpn vocaloid i own so i can't say if this works for other jpn vocaloids but it's probably not too different)

also i'm not an expert so this isn't a Complete Tips And Tricks List. these are just things i've learned to do

the M_0 phoneme is very useful, it's basically a U sound but with less voicing. you know how in japanese the U sounds are very quiet or inaudible in lots of words like "desu" and "masu" it's like that. with v4flower at least it's not totally quiet, there's a kind of metallic exhale that comes with it, so i reduce that by lowering the opening of the note usually all the way down to 0 and sometimes i'll also just edit it out in audacity. since words in japanese don't really end in consonants, consonant sounds at the end of notes will probably not happen so having the M_0 lets you basically have a vowel after it so it actually makes a sound without any out of place vowel sounds being too noticeable. "n" and "m" sounds don't need this though

the opening parameter is also useful to me!! with "er" sounds like in the words "better" and "never" i use an "o" phoneme and reduce the opening by about half and that usually sounds pretty close to an er sound. depending on the word and how it's sung i may want to use "a" or "e" sounds instead and reduce the opening more or less than usual. a less open "o" sounds also works for -le or -ul words like "horrible" and "awful"

i hate how loud t sounds are. luckily i recently realized that when i can't get away with replacing them with d sounds to make them softer and less jarring, i can just replace them with [Sil]. cuz sometimes when i say words with T in them in sentences like "that" or "it" i don't pronounce the t i just kind of, stop making sounds for a millisecond. idk if that makes sense but it can work in vocaloid especially in japanese bc then you don't always have to throw in a vowel sound after the t. this also works sometimes with p sounds. it doesn't always work it'll depend on the word itself and how it's being sung. but! if there are harmonies it can also work by removing sounds like "f" (which would be a p\ phoneme in japanese) and keeping them in the harmonies

and speaking of harmonies!! there's a neat trick i learned from miodiodavinci (known for their very cool zola project covers). unfortunately i can't find that curiouscat post and i cannot word things very well but here's my best explanation: having slightly different sounds in the harmonies than in the main vocals (particularly with vowel sounds) helps a lot!! like for example with the er sound i might have an o sound in the main vocals and an e sound in the harmonies so they kind of blend together to help make the elusive japanese er sounds...if you can't decide between two different sounds you can use them both if there's harmonies in that part of the song! this trick can work in other languages as well if ur having trouble with sounds

there are some shortcut phonemes i like to use a lot...for example with the word "try" i actually almost always have flower say "chai" (which in phonemes is [tS a i]) and it's still understandable in my opinion. if there's a d and a y sound next to each other sometimes i use a j sound. for example for the phrase "and you" which would be [e a n] [j M] (the M phoneme is a u sound) i would put a j sound in the middle so the d sound is still there. it would be [e a n] [dZ M]. this one might not always work because it might sound too harsh, in that case jut leaving out the d sound is fine.

also! depending on the word sometimes you can use a w sound instead of the r/l sound

basically just! figure out japanese phonemes and work with them to get the sounds you want. i hope this helped a little :)