原题可改为Has he been skating for a long time?
现在完成进行时改成一般疑问句就是把has,have,had提前,其他依原顺序即可
例如:They have been reading the books for 3 hours.改成Have they been reading the books for 3 hours?
原题可改为Has he been skating for a long time?
现在完成进行时改成一般疑问句就是把has,have,had提前,其他依原顺序即可
例如:They have been reading the books for 3 hours.改成Have they been reading the books for 3 hours?