1、现在完成时please open the door.I have already opened the door.I havent had dinner yet.have/has+doneI have already had dinner .Have you had dinner yet?Yes I have.No I havent.过去分词你规我就规，你不规归我也不规过去式work-worked-workedeat-ate-eaten现在完成时五大用法I have I have already already watered the flower.watered the flower.一、已
2、经完成的动作，强调对现在有影响一、已经完成的动作，强调对现在有影响。I haveI have just just washed the toilet washed the toilet。二、还没有做或者从来没有做过的事I I haventhavent taken a shower taken a shower yet yet.I have I have nevernever been to shang hai.been to shang hai.三、做一件事做好几次I have seen Titanic I have seen Titanic twicetwice。He has been to
3、 shang hai He has been to shang hai five timesfive times.四、见过、听过的最.的He is the fattest man I have ever seen.This is the most beautiful music I have ever heared.五、从过去一直持续到现在的动作或状态（for ，since）He has lived in beijing for 5 years.He has lived in beijing since 1981.sinceforhave/has been to,have/has gone to去过去那了She is not here.She_to the post office.have beenin (for,since)
