"Please be sure to come home on time" 是一种很好的表达方式。"Please" 是"请"的意思，"be sure" 意为"务必"，"to come home on time" 意思是"按时回家"。这句话的意思就是"请务必按时回家"。

下面是一些其他的表达方式：

"Please make sure to come home on time"
"Please be sure to return home on time"

这些表达方式的意思都与"请务必按时回家"类似。

例句：

"Please be sure to come home on time. Dinner will be ready at 6:00 PM." (请务必按时回家。晚饭将在 6:00 PM 准备好。)
"I'm counting on you to come home on time. Please be sure to do so." (我指望你按时回家。请务必这样做。)