Question

2．上車前請排隊，不要擁擠．
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．這里是祈使句，用動詞原形開頭．排隊用stand in line，上車前before getting on the bus，before是介詞，表示在…之前，后跟動名詞．故答案是Stand in line before getting on the bus．

點評 祈使句的幾種形式：
1．肯定祈使句（謂語動詞用動詞原形）．如：Be careful!小心！
2．否定祈使句（在謂語動詞前加Do not/Don't/Never）．如：Don't open the door．不要開門．  
3．Let開頭的祈使句（Let's/Let sb+動詞原形）．如：Let me have a try．讓我試試吧．