i lost my key和i have lost my key有什么区别?分别是什么时态和意思有什么不同?

i must have lost my key~不用have行不? i lost my key和i have lost my key有什么区别?分别是什么时态和意思有什么不同? I have lost my key;I can't remember where I forgot it改错 I lost some(key) i have lost my wallet和i lost my wallet有什么区别呀 I lost my wallet和I have lost my wallet 意思上有什么区别 I have to wait for my mother,for l have lost the key of the door哪里错了 What has happened?What has happened?---I have lost my key and can't open the door.为什么不能用What happened?---I lost my key and i can't open the door.两者的区别是什么? I have never lost my heart i have lost my heart for you? Time (Have I Lost My Mind?) 歌词 I have lost my new English dictionary have i lost my faith in you? I can't find the key to my office,I( )have lost it on my way homeA would B should C must D ought to U___ ,i found my key lost in my office when i got home last night I am a( )I have left my key at home What did you do with your car?I lost my key,so I have to( )it in the park.A.lock B.repair C.leave D.pass always与动词一般时连用和always与动词进行时连用,二者之间有什么区别?这个问题应该选什么?I have lost my key again.I ____ things.A.always lose B.am always losing C.always lost D.have always lost正确答案为什么是B?