请指正以下politequestion.用法是否正确?canyouhelpme?couldiaskyouifyoucanhelpme?whatdidyoucarcost?couldiaskyouwhatyoucarcosted?

Question

请指正以下polite question.用法是否正确?
can you help me?
could i ask you if you can help me?
what did you car cost?
could i ask you what you car costed?

Answer 1

could i ask you if you can help me?去掉you改成could i ask if you can help me?if从句作ask的宾语what did you car cost?改成how much did you car cost?could i ask you what you car costed?改成could i ask （...