Section A (Grammar focus - 4c)Unit 10 I've had this bike for three years.现在完成时have/ has +过去分词 不规则动词过去分词的构成1. 三个主要动词 is, ambe arewaswerebeenhave/hashadhaddo/doesdiddone2. AAA型 （三者一致）cut cut cutlet let letput put putcost cost cost read read read3. ABA型 （过去分词与原形一致）comebecomerunran run came comebecame become4. ABB型 （过去分词与过去式一致）bringfindhearkeepmakebrought broughtfound foundheard heardkept keptmade madeleaveleft leftwinwon wontelltold toldspendspent spentsaysaid said5. ABC型 （三者不一致）eatgivewriteseegetbegin ate eaten gave givenwrote written saw seen got gotten began begungo went gonetake took taken speak spoke spokenknowknew knownswimswam swum现在完成时的用法：1. 表示已完成的某一动作对现在造成的影响或结果1） 标词:already:yet:多用述句，位have/has后，有时位句末。用疑问句和否定句，位句尾。 ever :never:多用疑问句，问初次经历。用否定句，位have/has后e.g.我已经完成了。e.g.你找到你丢失的书了吗？我还没吃早饭呢。e.g.你曾去过一个游乐园吗？e.g.我从未看过这么 |
