Question

2．除非你亲眼看见，不然你想象不出地震有多可怕．You can't imagine how terrible an earthquake is unless you see it with your own eyes．．

Answer 1

分析 You can't imagine how terrible an earthquake is unless you see it with your own eyes．

解答 答案：You can't imagine how terrible an earthquake is unless you see it with your own eyes．表示除非用unless引导的条件状语从句，主句是你想象不出地震有多可怕，主语You，用情态动词can的否定式can't表示不能，后加动词原形imagine想象，后加上感叹句作为宾语从句，可怕的terrible是形容词，故用how来修饰，结合感叹句的句型How+adj/adv+主语+谓语！故how terrible an earthquake is．主句含有情态动词，从句用一般现在时代替一般将来时，从句是除非你亲眼看见，主语是you，看见see it，用自己的眼睛with your own eyes．故答案是You can't imagine how terrible an earthquake is unless you see it with your own eyes．

点评 if或unless引导的条件句使用如下：
1．主语用一般将来时，从句用一般现在时表将来；
2．主句一般现在时或含情态动词can，may，must，should等，从句一般现在时；
3．主句为祈使句，从句也常用一般现在时