【現在完了の解答】 
１．
　⑴ I  have  eaten  this  food. 
　⑵ They  have  been  in  Japan. 
　⑶ We  have  heard  the  music. 
　⑷ She  has  been  busy. 
　
２．
　⑴ They  have  not  had  breakfast. 
　⑵ She  has  not  met  Ken. 
　⑶ Have  you  visited  England? 
　⑷ Has  he  done  his  homework? 

３．
　⑴ He  has  just  come  home. 
　     彼はちょうど帰ってきたところです。 
　⑵ I  have  already  finished  the  work. 
　     私はすでに仕事を終えてしまいました。 
　⑶ She  hasn't  seen  the　movie  yet. 
　     彼女はまだその映画を見ていません。 
　⑷ Has  Bob  arrived  in  Tokyo  yet? 
　     ボブはもう東京に着きましたか。 

４．
　⑴ I  have  stayed  here  for  two  days. 
　     私は2日間ずっとここに滞在しています。 
　⑵ He  has  known  the  girl  since  this  summer. 
　     彼は今年の夏からずっとその女の子を知っています。 
　⑶ She  has  been  sick  for  a  week. 
　     彼女は1週間ずっと病気です。 
　⑷ He  has  lived  in  this  town  since  last  week. 
　     彼は先週からずっとこの町に住んでいます。 
　⑸ Has  your  father  wanted  the  car  for  a  long  time? 
　     あなたのお父さんは長い間その車を欲しがっているのですか。 

５．
　⑴ My  mother  has  been  cooking  in  the  kitchen  since  this  morning. 
　     私の母は今朝からずっと台所で料理をしています。 
　⑵ They  have  been  talking  about  music  for  two  hours. 
　     彼らは2時間ずっと音楽について話をしています。 
　⑶ It  has  been  raining  hard  since  yesterday. 
　     昨日からずっと雨が激しく降っています。 
　⑷ My  daughter  has  been  playing  the  piano  for  thirty  minutes. 
　     私の娘は30分間ずっとピアノを弾いています。 
　⑸ Have  you  been  doing  your  homework  for  an  hour? 
　     あなたは1時間ずっと宿題をしているのですか。 
　     
６．
　⑴ I  have  written  a  letter  in  English  once. 
　     私は１度英語で手紙を書いたことがあります。 
　⑵ He  has  read  the  story  twice. 
　     彼は２度その物語を読んだことがあります。 
　⑶ My  sister  has  drawn  that  lake  many  times. 
　     私の姉（妹）は何度もあの湖を描いたことがあります。 
　⑷ I  have  never  seen  a  lion. 
　     私は１度もライオンを見たことがありません。 
　⑸ Have  you  ever  made  a  dog  house? 
　     あなたは今までに犬小屋を作ったことがありますか。 

７．
　⑴ Ken  has  bought  a  camera. 
　⑵ She  has  lost  her  watch. 

８．
　⑴ 私は３年間イギリスにいます。 
　⑵ 私は３回イギリスに行ったことがあります。 

９．
　⑴ How  long  has  he  known  Tom? 
　⑵ How  many  times ( How  often ) has  he  been  to  London? 

10．
　⑴ known  　 
　⑵　did   　
　⑶　came   　
　⑷　bought   
　⑸　been　　
　⑹　never 

11. 
　⑴ I  have  not  eaten  lunch  yet. 
　⑵ Have  you  written  a  letter  yet? 
　⑶ He  has  just  arrived  here. 
　⑷ I  have  never  been  to  America. 
　⑸ Where  have  you  been? 
　⑹ Have  you  ever  played  tennis? 
　⑺ How  often  ( How  many  times )  have  you  seen  him? 
　⑻ They  have  been  playing  baseball  for  an  hour. 
　⑼ Have  you  ever  visited  Nara? 
　⑽ How  long  have  you  been  sick? 
　⑾ Mika  has  been  cleaning  her  room  since  this  morning.