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How long have you been in Nagoya?
Have they been in Japan since 1995?
Yes,they have.
Taku and Aya have played tennis since last year.
Has he studied math since this morning?
How long has Ken been busy?
こんな感じですかね？
参考になると嬉しいです。
ありがとうございます。参考にさせていただきます