【误】I have bought a pen but I have lost it now.(have bought表示你现在已经有笔了,这和后面的have lost有矛盾)
【正】I bought a pen but I have lost it now.
我(过去)买了一支笔,但我已经把它丢了。
【误】I have lost my pen but I have found it now.(have lost强调你现在已经没有笔了,与后面have found的意思有冲突)
【正】I lost my pen but I have found it now.
我丢了一支笔,但现在已经找到了。
②表示经历的现在完成时
强调过去某一时刻到说话时这段时间中的经历。
Have you ever been to the Great Wall?
你去过长城吗?
I have visited Beijing at least ten times.
北京我至少访问过十次了。
She has never spent a holiday at the seaside.
她从未到海滨度过假。
③表示延续的现在完成时
这是现在完成时的“未完成”用法,表示一个动作或状态从过去某时开始,持续到现在,可能要继续下去。
He's loved fishing for a long time.
他爱好钓鱼为时已久。(他现在仍爱好钓鱼)
I have lived here for more than thirty years.
我已在这儿住了三十多年了。(也许还会继续住下去)
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