山東省濰坊高新技術(shù)產(chǎn)業(yè)開(kāi)發(fā)區(qū)東明學(xué)校九年級(jí)英語(yǔ)上冊(cè)module2unit3languageinuse課件新版外研版(編輯修改稿)
2025-07-03 01:53 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 續(xù)性動(dòng)詞，也可以是非延續(xù)性動(dòng)詞。 while意思是“當(dāng) …… 的時(shí)候”，由它引起的從句中必須用動(dòng)詞 be、延續(xù)性動(dòng)詞或動(dòng)詞的進(jìn)行時(shí)態(tài)，而不可用終止性動(dòng)詞。如： I was walking in the street when the UFO landed. He came to see me while I was having dinner. while 還可以表示兩者同時(shí)進(jìn)行。 I was doing my homework while my parents were watching TV. till 均可引起時(shí)間狀語(yǔ)從句，表示“直到某時(shí)為止”，當(dāng)主句動(dòng)詞為延續(xù)性動(dòng)詞時(shí)常用肯定式，當(dāng)主句動(dòng)詞為終止性動(dòng)詞時(shí)常用否定式，如： He kept working until (till) it began to rain. He didn’t go to bed until (till) he finished his homework. (他直到做完作業(yè)才上床睡覺(jué)。 ) 區(qū)別： till和 until用作連詞或介詞均可表示“直到 …… 為止”，但放在句首時(shí)一般不用 till而用 until，如： Until then, I knew nothing about it. Until it began to rain, they kept on working in the field. 鞏固練習(xí) 1. He was so tired that he fell asleep _____ he went to bed. (1) A. as if B. even though C. ever since D. as soon as 2. John fell asleep _____ he was listening to music. (10)
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