外研版高中一年级( 第 1 册 )Module 4 A social survey—My neighborhoodGrammar1. 现在完成时用来表示现在之前已发生或完成的动作或状态 , 但其结果却和现在有联系 ,也就是说 , 动作或状态发生在过去但它的影响现在还存在 . I have lost my wallet.( 含义是 : 现在我没有钱花了 .) Jane has laid the table.( 含义是 : 已可以吃饭了 .) Michael has been ill.( 含义是 : 现在仍然很虚弱 ) 2. 现在完成时可以用来表示发生在过去某一时刻的 , 持续到现在的情况 , 常与 for,since 连用 . Mary has been ill for three days. I have lived here since 1998. 3. 现在完成时往往同表示不确定的过去时 间状语连用 , 如 already, yet, just, before, recently, lately 等 : He has already obtained a scholarship. I haven't seen much of him recently (lately).We have seen that film before. Have they found the missing child yet ?4. 现在完成时常常与表示频度的时间状语连用 , 如 often, sometimes, ever, never, twice, on several occasion 等 : Have you ever been to Beijing?I have never heard Bunny say anything against her. I have used this pen only three times. It is still good. George has met that gentleman on several occasions.5. 现在完成时还往往可以同包括现在时间在内的时间状语连用 , 如 now, up to these few days/weeks/months/years, this morning/week/month/year, now, just, today, up to present, so far 等 : Peter has written six papers so far. Man has now learned to release energy from the nucleus of the atom. There has been too much rain in San Francisco this year. The friendly relations and cooperation between our two countries have been enhanced in the past few years. Up to the present everything has been successful. 6. 现在完成时表示现在之前业已完成的动作 , 虽然其效果或影响仍然存在但已不再继续 , 但是有一些现在完成时的句子 , 在后面加上 for+ 一段时间 , 则现在完成时的动作就表示延续性 . Thomas has...
