057 完了形(Perfect Tense)② 継続の用法
【解説】
「（ずっと）～している」
「現在の状況」が「過去のある時点から継続」していることを表す
for:期間（ある状態が続いた長さ）
since:時点（ある状態が始まった時点）
I have played basketball for ten years.
I have played basketball since I was eight.
【例文】
1 My sister lives in Kyoto.
現在形：現在の日常的な動作を表す
cf. She is living in Kyoto.
進行形：一時的な動作を表す
「（今のところ）京都に住んでいます」
2 My sister moved to Kyoto ten years ago.
過去形：過去のある時点での動作を表す
現在の状況（京都に住んでいるかどうか）は不明
3 My sister has lived in Kyoto for ten years.
4 I have studied English since I was eight.
5 How long have you studied English?
6 Ten years have passed since my dog died.
7 We have known each other for six months.
8 It has not rained for three days.
9 I have not seen him since I moved to Chiba.
10 I have been sick since last week.
