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?

The pen I ___I___is on my desk.A.thought;have lost B.thought;had lostC.think;had lostD.think;lost 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? Where is my pen?I_____it A.might lose B.would have lost C.should have lost D.must have lost 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 lost i my pen week last连词 Where is my pen?I _____ it.A.might loseB.would have lostC.should have lostD.must have lost选择原因? 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 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! where is my pen? I　＿＿＿　it．A. might lose B. must have lost 选B.但A为什么不可以?也是表推测啊 Where is my pen?I_____it.（b）A.should have lost B.must have lost C.would have lost D.might lose为什么不是d？ --My pen is lost and I can't fond it anywhere .---So you will have to buy ______.A.itB.fewC.any D.one she said :i have lost a pen 改为间接引语怎样变? The following ,which is right?A.my pen has lost.B.My pen is lost I will have to borrow your pen,because I ___ my pen at home just now.A.lost B.have lost C.left D.have left我自己认为因为落在家里 用left 由于对现在有影响（have to borrow）所以选D 可是答案是A mum.i 've lost my pen again.i knew it- sorry mum.i 've lost my pen again.- i _______ it.you never remember to put your things away after using them.A.knew B.know C.have known D.will know应该选A.为什么不是C?表示我已经知道了.不是很 I have lost my interested ( ) physics.I have lost my interested ( ) physics.A .in B .on C .at D .for 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