The table summarizes the plain form and polite forms of nouns, verbs, Na adjectives, and I adjectives.
KEY:
この適切な活用が、日本語を難しくしている原因のひとつです。活用には一定のルールがありますので、考え方さえ理解していれば、難しくはありません。

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We have developed an arrangement optimization system that carefully analyzes a student’s preferences and requirements.
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It is said that there are about 1.3 million foreigners working in Japan on work visas. Many of them may