Question

2．上车前请排队，不要拥挤．
Stand in line before getting on the bus．Don't push your way onto the bus．

Answer 1

分析 Stand in line before getting on the bus．

解答 答案：Stand in line before getting on the bus．这里是祈使句，用动词原形开头．排队用stand in line，上车前before getting on the bus，before是介词，表示在…之前，后跟动名词．故答案是Stand in line before getting on the bus．

点评 祈使句的几种形式：
1．肯定祈使句（谓语动词用动词原形）．如：Be careful!小心！
2．否定祈使句（在谓语动词前加Do not/Don't/Never）．如：Don't open the door．不要开门．  
3．Let开头的祈使句（Let's/Let sb+动词原形）．如：Let me have a try．让我试试吧．