Where are my keys Where I left it
是的,第二句有两处错误,用改为：Where have I left them?我把它们忘哪儿啦?
the keys为复数名词,应用代词them;where在句中作状语,用用疑问词+一般疑问句结构.（现在完成时态,强调结果.原句陈述句可理解为：I have left them in my bedroom/on the desk……,对地点提问)