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—They are seventeen yuan. ☆ 用于計(jì)算: How much is eight and nine? ——It39。s seventeen. 單數(shù)提問(wèn)牢記: is 是 、 this 這個(gè) 、 that 那個(gè) ,都是指 單數(shù) 例: Whose radio is this? 這是誰(shuí)的收音機(jī)? It39。s Bobby39。s. 是鮑比的。 復(fù)數(shù)提問(wèn)提問(wèn)牢記: are 是 、 these 這些 、 those 那些 ,都是指 復(fù)數(shù) 例: Whose CDs are these? 這些是誰(shuí)的光盤(pán)? They39。re Ken39。s. 它們是肯的。 單數(shù)變復(fù)數(shù): is 變成 are 例如: This is 變成 These are That is 變成 Those are 名詞單數(shù)變名詞復(fù)數(shù)(要加 s / es /變 y 為 i 再加 es) 注意下列劃線(xiàn)部分變化 例如:?jiǎn)螖?shù)句型 This is Ken39。s walkman. 變成復(fù)數(shù)→ These are Ken39。s walkmans. 單數(shù)句 型 That is Mocky39。s video. 變 復(fù) 數(shù) : Those are Mocky39。s videos. 復(fù)數(shù)變單數(shù): are 變成 is These are變成 This is Those are 變成 That is 復(fù)數(shù)名詞加了 s ,單數(shù)就變回原形 例:復(fù)數(shù)句型 : These are Ann39。s cassettes. 變單數(shù)→ This is Ann39。s cassette. Those are Aunt Booky39。s CDs. 變單數(shù)→ That is Aunt Booky39。s CD. 句型表達(dá): 現(xiàn)在進(jìn)行時(shí)的表達(dá)形式:動(dòng)詞 +ing: +ing: 例如: studying 學(xué)習(xí) eating 吃 2. 去結(jié)尾 e+ing: 例如: dancing 跳舞 writing 寫(xiě)字 3. 雙寫(xiě)結(jié)尾字母 +ing: 例如: running 跑步 swimming 游泳 現(xiàn)在進(jìn)行時(shí),疑問(wèn)句型: be(am, is, are)+doing 例: What is he doing? 他在干什么? He is sleeping. 他在睡覺(jué)。 一般現(xiàn)在時(shí)的句型 例如:介紹房間→ This is the living room. 這是客廳。 一般疑問(wèn)句(分單數(shù)提問(wèn) /復(fù)數(shù)提問(wèn)): 單數(shù)提問(wèn): Is this your pen? 這是你的鋼筆嗎? Yes, it is. 是的,它是。 復(fù)數(shù)提問(wèn): Are these our books? 這些是我們的書(shū)嗎? Yes, they are. 是的,它們是。