i lost my pen.i have to write with a pencil这个句子为什么要把lost改为have lost呢?

lost i my pen week last连词 i lost my pen.i have to write with a pencil这个句子为什么要把lost改为have lost呢? The pen I ___I___is on my desk.A.thought;have lost B.thought;had lostC.think;had lostD.think;lost I have created friendships ( ) my pen friend The pen I ( ) I ( ) is on my desk,right under my nose.A.think;lost B.thought;had lost C.think;had lost D.thought;have lost这道题应先哪个?有哪位朋友能从语法的角度分析一下? The pen I _____ I _____ is on my desk,right under my nose. A.think;lost B.thought;had lost C.think;had lost D.thought;have lost 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? 一般过去时和现在完成时的区别比如 I lost my pen和I have lost my pen的区别是什么在什么情况下用过去时,什么情况下用完成时 The pen I ________ I ________ is on my desk,right under my nose.A.think; lost B.thought; had lostC.think; had lost D.thought; have lost为什么D不行啊 Where is my pen?I _____ it.A.might loseB.would have lostC.should have lostD.must have lost选择原因? 填同义句my pen was lost.I( ) ( ) my pen.I didn't have any money for a taxi.I （ ） （ ）money for a taxi.What cool weather it was!( ) ( ) the weather was! I have lost my pen,and I ______(look)for it now.问：用现在完成时好呢,还是现在完成进行时好呢? I have lost my life since I met you. I have lost my true love what can i do?