卡车的种类: dump truck, tow truck, garbage truck, cement mixerfire truck, tanker truck, car transport, armored truck, heavy haulertractor trailer 形容词性物主代词的用法，例如: my, its 指示代词的用法，例如: this, these 介词的用法，例如:in,on 连词的用法，例如:and,or 特殊疑问句，例如:How cool is this? 祈使句，例如: Let's get this bling to the bank! There be 句型，例如: There are all kinds of fire trucks.