现在完成时He has lived here since 1949.
疑问句;Has he lived here since 1949?
否定句：He hasn't lived here snice 1949.如果是三人称是不是都用HAS例如she hasfinished my homeworkHas she finished your homework?shehasn't finished my homework嗯对的！You are right！谢谢，以后有问题还找你哈