So do I .( 因为have 作实义动词）
have 作助动词时,如He has been to Beijing ,so have I.I have to go to school tomorrow.回答是什么呢？I have to go to school tomorrow， so does he /so do they .( 注：HAVE TO 相当于情态动词，但变疑问句或否定句时要加助动词do / does )I haven't seen the film "阿凡达" .现在完成时吧？是用Neither have I是吧？是的