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【答案】1. Good morning, class. 2. Lili, please open the door. 3. Bingbing, please close the window. 4. What's this? 5. This is a robot.
【解析】
1. 早上好是“Good morning”, 同学们“class”。故答案为: Good morning, class.
2. 请“please”, 打开门是短语“open the door”。故答案为:Lili, please open the door.
3. 请“please”, 关窗户是“close the window”。故答案为: Bingbing, please close the window.
4. 这“this”, 是,be动词用is,什么“what”。句子是特殊疑问句,疑问词放句首,首字母大写,其次是be动词,最后放this,故答案为: What's this?
5. 这是“This is”, 机器人是“robot”。robot是单数名词,表示数量一,前面用不定冠词a,故答案为: This is a robot.