1.makesurethedoorbeforeyouleave.2.现在完成进行时中能不能用inthepast3.that;inthat;which;inwhich的区别?

Question

1.make sure _____ the door before you leave.
2.现在完成进行时中能不能用in the past
3.that ; in that ; which ; in which 的区别?

Answer 1

1.make sure __that__you lock _ the door before you leave.----make sure + that + 陈述句（时态用现在时）
2.现在完成进行时中能不能用in the past---------不能,只能用“一般过去时”------She lived here in the past. 但如果有具体时间段,就用现在完成时： She has lived here in the past 5 years.
3.that ; in that ; which ; in which 的区别?--------这个说来话长,要5个小时.未完待续.