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Below is a more detailed for Katakana.
Katakana Long Vowel Ⅰ
The first rule is that when an English word ends with "-er / -or / -ar / -y" it is written with a long vowel mark.
In addition, when an English word ends with "-re" it is written with a long vowel mark. Particularly, "-ure" and "-tre" almost all require a long vowel mark.
Katakana Long Vowel Ⅱ
The sound rule is that when "oa / ee / oo" in the middle of an English word, it is written with a long vowel mark.
Katakana Long Vowel Ⅲ
The third rule is that when an English word contains "ea" It is written with a long vowel mark, just like "ee" but, some "ea" words pronounce as "ai / ia / e" and there are exceptions. Therefore, it is necessary to check Katakana spelling for each word. Here are some examples of representative words containing "ea" and some exceptions.
Katakana Long Vowel Ⅳ
The fourth rule is when English words end with suffixes "-ete / -ote / -ute / -late" It is written with a long vowel mark before "te".
The first rule is that when an English word ends with "-er / -or / -ar / -y" it is written with a long vowel mark.
In addition, when an English word ends with "-re" it is written with a long vowel mark. Particularly, "-ure" and "-tre" almost all require a long vowel mark.
Katakana Long Vowel Ⅱ
The sound rule is that when "oa / ee / oo" in the middle of an English word, it is written with a long vowel mark.
Katakana Long Vowel Ⅲ
The third rule is that when an English word contains "ea" It is written with a long vowel mark, just like "ee" but, some "ea" words pronounce as "ai / ia / e" and there are exceptions. Therefore, it is necessary to check Katakana spelling for each word. Here are some examples of representative words containing "ea" and some exceptions.
Katakana Long Vowel Ⅳ
The fourth rule is when English words end with suffixes "-ete / -ote / -ute / -late" It is written with a long vowel mark before "te".
The first rule is that when an English word ends with "-er / -or / -ar / -y" it is written with a long vowel mark.
In addition, when an English word ends with "-re" it is written with a long vowel mark. Particularly, "-ure" and "-tre" almost all require a long vowel mark.
Katakana Long Vowel Ⅱ
The sound rule is that when "oa / ee / oo" in the middle of an English word, it is written with a long vowel mark.
Katakana Long Vowel Ⅲ
The third rule is that when an English word contains "ea" It is written with a long vowel mark, just like "ee" but, some "ea" words pronounce as "ai / ia / e" and there are exceptions. Therefore, it is necessary to check Katakana spelling for each word. Here are some examples of representative words containing "ea" and some exceptions.
Katakana Long Vowel Ⅳ
The fourth rule is when English words end with suffixes "-ete / -ote / -ute / -late" It is written with a long vowel mark before "te".
For more information about Katakana is here, introduction to Consonant in Katakana.
Next, Introduction to Onomatopoeia
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