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外研2003课标版《Grammar》优质课PPT课件下载
主句谓语形式
与现在事实相反
would/could/might/ should + do
与过去事实相反
had done
与将来事实相反
would/could/might/ should + do
would/ could/ might/ should + have done
did/were
1.did /were
2. were to do
3. should do
What would you do if you won the lottery?
If I won the lottery, I would…
If I (win) the lottery, I (buy) an expensive car. (与现在事实相反）
won
would buy
If I the ticket,
I on board.
If I on board,
I you.
If the ship (not strike) an iceberg, it shouldn’t have sunk.
If there had been enough life
boats, we (survive). (与过去事实相反）
hadn’t won