1) as if he had been on the scene of the accident
2) we finish the work by tomorrow
(insist that S 原形)
3) It is about time she knew her limitations.
(high time→とっくに)
(about time→そろそろ)
4) If you should miss the train, call me.

ポイントになりそうな表現に気をつけてみてください
(^-^)