Unit3 The Computer and the Information Age-grammar教案
iwas told that the old man had been away for a week. 2>未完成用法。表明某個動作或狀態(tài)在過去某個時刻之前一直延續(xù)到過去這個時間，而且還可能繼續(xù)下去。它也使用于動作和狀態(tài)動詞。而且常和 by +過去時間 或從句 連用。如： by 12,he had studied for 4 hours. by we got there,they had ended the meeting. we had worked together for a long time before we came to this college . 3>警示：在by + 過去時間或從句的結(jié)構(gòu)中，如果主句動詞是動作動詞，用過去完成時，如果是狀態(tài)動詞，用一般過去時。比較： by the end of last year,he was 12. by the end of last year,he had learned 300 english words. 另外，在---hardly---when/ ---no sooner---than---的句中，主句用過去完成時，從句用一般過去時。而且，如果hardly./no sooner 提前，主句需要部分倒裝。如： i had hardly recoganized him when i saw him. hardly had i recoganized him when i saw him.