完了形の書き換え（It is ～ since / 過去形と完了形）
着眼点「～して以来…年になる」は定番の書き換え。
| 型 | 例 |
|---|---|
| It is ＋期間＋since S ＋過去形 | It is ten years since he died. |
| ＝ S has been dead for ten years | He has been dead for ten years. |
| ＝ ten years have passed since ～ | Ten years have passed since he died. |
例文
1
It is three years since I came to this town.
この町に来て3年になる。
2
I have been here since noon.
私は正午からずっとここにいる。
注意since の節は過去形、主節は現在完了（または is）。