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treet. The alien went into a store. An alien got out of the UFO. 54132 Listen again. Complete the following sentences with “when” or “while”. 2b 1. The boy was walking down the street a UFO landed. 2. The girl was shopping she saw the alien get out. 3. the alien was buying a souvenir, the girl called the police. 4. the alien was visiting the museum, the boy called the TV station. when when While While 比較 “ when” and “while” 1. when “當(dāng) ….. 時(shí)候” 后面跟的動(dòng)作 不延續(xù) , 常跟 一般過(guò)去時(shí) When the UFO took off, the boy was taking photos. 1. while “當(dāng) ….. 時(shí)候” 后面跟的動(dòng)作 延續(xù) , 常跟 過(guò)去進(jìn)行時(shí) While the boy was taking photos, the UFO took off. Target Language: 比較 “ when” and “while” 2. When the UFO landed, the boy was walking down the street. While the boy was walking down the street, the UFO landed 1. When the alie