What do you have on Thursday?你周四一般吃些什么?(注意时态的运用导致意思的细微变化,下同)
What did you have on Thursday?你周四吃了什么?(特指过去的某一个周四)
注意:What have you done on Thursday.其实是语法错句,其使用了现在完成时态,时间状语却使用了强调时间点而不是时间段的on Thursday.语法上推敲,要说"周四那天你干了什么"应用一般过去时,可以说What did you do on Thursday?,如果要说"自周四以来你都干了些什么?"应用现在完成时,可以说What have you done since Thursday?