Lesson 1
To describe how something is done, you turn い(i)-adjectives into adverbs (their く(ku)-form)
楽しい (ta-no-shi-i) = fun; enjoyable; pleasant; happy; delighful (たのしい)
楽しく (ta-no-shii-ku) = funnily; enjoyably; pleasantly; happily; delightfully (たのしく)
面白い (o-mo-shi-ro-i) = interesting; fascinating (おもしろい)
面白く (o-mo-shi-ro-ku) = interestingly; fascinatingly (おもしろく) Notice how the く(ku)-form is similar to adding -ly to English adjectives.
なる (to become) なる (na-ru) = to become なります (na-ri-ma-su) = to become (polite)
なっている (na-tte-i-ru) = becoming なっています (na-tte-i-ma-su) = becoming (polite)
なった (na-tta) = became なりました (na-ri-ma-shi-ta) = became (polite)
暑い (atsu-i) = hot; warm (あつい)
暑く (atsu-ku) = (く(ku)-form) hotly; warmly (あつく)
暑くなっている (atsu-ku-na-tte-i-ru) = becoming/getting hot; warm (あつくなっている) 暑くなった (atsu-ku-na-tta) = (it) became/got hot; warm (あつくなった )
から (ka-ra) = since; because
楽しいから (ta-no-shii-ka-ra) = since/because it is fun (たのしいから)
面白いから (o-mo-shi-ro-i-ka-ra) = because it is interesting (おもしろいから)
面白くします (o-mo-shi-ro-ku-shi-ma-su) = makes it interesting (おもしろくします)
Lesson 2
愛 (ai) = love (あい)
愛する (ai-su-ru) = (to) love
疲れる (tsuka-re-ru) =to get tired; to get fatigued; to become exhausted;
怖い (ko-wai) = scary (こわい) 怖いです (ko-wa-i-de-su) = it is scary (こわいです) 怖いんですか?
怖かったです (ko-wa-ka-tta-de-su) = it was scary (こわかったです) 怖かったですか?(ko-wa-ka-tta-de-su-ka) = was it scary? (こわかったですか)
Lesson 3
暇 (hi-ma) = free/available (ひま)
つまらなかった (tsu-ma-ra-na-ka-tta) = it was boring つまらなかったですか?(tsu-ma-ra-na-ka-tta-de-su-ka) = was it boring?
困る (koma-ru) = to be troubled; to have difficulty; (こまる)
困りました (ko-ma-ri-ma-shi-ta) = I am troubled/in trouble (こまりました)
困っています (ko-ma-tte-i-ma-su) = I am in trouble (こまっています)
わかりました (wa-ka-ri-ma-shi-ta) = I understand
Lesson 4
Lesson 5
嬉しい (u-re-shii) = happy (うれしい)