Could I borrow your computer?Sorry,but I need it 回答为什么非要加but

Could I borrow your computer?Sorry,but I need it 回答为什么非要加but Could I borrow the car?__,but I need it.I have to go to a me Could I borrow your bike?___,but please return it by Saturda couLd i borrow your book?否定回答 CAN I USE YOUR BIKE?SORRY,TOM ,BUT IT( ) could I borrow your bike?yes,of course you___,but you mustn' -Could i borrow your camera?-( ).But you will have to buy so could i use your book?i'm sorry but i( )use the book myself I am sorry,but I forgot your name.为什么连词but不可以换成beacuse? It\'s my fault! I\'m sorry!But I don\'t konw what could do!是 May I borrow your book?Sure.But please return it s_________. -Can I borrow your car?-Sure,but ___.A.you must return it ba