I’m adoing bad guly

Just a heads up that "a bad guy" normally means like... a movie villain

But I don't write any diaryies in English.

mMaybe it is valuable for me.

For example, I don't know why speakingthe pronunciation of "gh" in "enough" is different from "gh" in "ghost".

Position mostly. gh at the end of words is usually a f sound (though there are exceptions, like "nigh" which is pronounced sort of like ない), but g at the start of words is more of a ぐ sound. Unlike Japanese, English has multiple sounds per letter and some loan words have just straight up kept their original pronounciation from other languages even if it doesn't follow standard English pronounciation.

English as a language at its core is sort of a hybrid between historical German and French, but has borrowed words from tons of other languages without fully forcing them to conform to English pronunciation and spelling, so its writing system is not really phonetic.

There's a semi-famous example, "ghoti", which is a made up word. Normally an English speaker who has never seen it before would try pronouncing it as "goatee", but the author who made it up made an argument that it should be pronounced "fish" by comparing it to the "gh" in enough, the o in "women" and the "ti" in "nation".

bBye.

Three weeks ago, I said that "I want to be an English master" 3 weeks ago."

It feels more natural to place the time at the beginning of the sentence, since this is a 'new' conversation topic

But I doidn't write any diary entries in English.

"didn't" to show the past (because you wrote an entry now, so this isn't current anymore)

mMaybe it is valuable for me.

I have many questions about English.

many = more than 1
question -> question(s)

I said "I want to be an English master" 3 weeks ago.

"An" before a word starting with a vowel. "A" before a word starting with a consonant.

But I don't write a diary in English.

OR: But I don't write in my English diary every day.

mMaybe it is valuable for me.

Use a capital letter at the start of every sentence.

I have many questions about English.

For example, I don't know why speaking "gh" in "enough" different "the sound of "gh" is different between "enough" inand "ghost".

bBye.