『【速習英単語】』Happy Study (楽しい勉強を…|bit.ly/152WKab
『【速習英単語】』Happy Study (楽しい勉強を…|bit.ly/152YKzk
【過去進行形】I was studying English. wiki.bicmap.com/index.php?%E5%…
【過去形】I studied English. wiki.bicmap.com/index.php?%E5%…
【未来形】I will study English. wiki.bicmap.com/index.php?%E5%…