Talking About What You Did in Japan

To say you 'only' do something, place だけ [dake] behind the subject.

• 映画を見ます [eiga o mimasu] I watch a movie. → 映画だけ見ます [eiga dake mimasu] I only watch movies.
• 本を読みます [hon o yomimasu] I read books. → 本だけ読みます [hon dake yomimasu] I only read books.

日本語だけ勉強します [nihongo dake benkyōshimasu]
I only study Japanese.

• 日本語 [nihongo] means "Japanese"
• だけ [dake] means "only"
• 勉強します [benkyōshimasu] means "I study"
• Literally means "Japanese, only, I study"

日本にだけ行きましたか [nihon ni dake ikimashita ka]
Did you only go to Japan?

• 日本に [nihon ni] means "to Japan"
• だけ [dake] means "only"
• 行きましたか [ikimashita ka] means "Did you go?"
• Literally means "to Japan, only, did you go?"

To say you 'also' do something, place も [mo] behind the subject.

• 映画を見ます [eiga o mimasu] I watch a movie. → 映画も見ます [eiga mo mimasu] I also watch movies.
• 本を読みます [hon o yomimasu] I read books. → 本も読みます [hon mo yomimasu] I also read books.

スペイン語も勉強します [supeingo mo benkyōshimasu]
I also study Spanish.

• スペイン語 [supeingo] means "Spanish"
• も [mo] means "also"
• Literally means "Spanish, also, I study"

韓国にも行きました [kankoku ni mo ikimashita]
I also went to Korea.

• 韓国に [kankoku ni] means "to Korea"
• も [mo] means "also"
• 行きました [ikimashita] means "I went"

• A: 先月はどこに行きましたか
  Where did you go last month?
• B: 東京に行きました [tōkyō ni ikimashita]
  I went to Tokyo.
• A: 東京にだけ行きましたか
  Did you only go to Tokyo?
• B: いいえ、大阪にも行きました [iie, ōsaka ni mo ikimashita]
  No, I also went to Osaka.
• A: あ、いいですねえ!
  Oh, that sounds nice!