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t ____(afford) a TV because they were really expensive. 4)A friend of ____ (I) came to see me last week. 5)I think you need to ___ (take) a history class. The keys: 1) invented 2) help 3) afford 4) mine 5) take Homework a passage about a new invention and introduce it. some relevant exercises . Thank you ! 。 被動語態(tài)的構(gòu)成: 主語 + be + 動詞的 .過去分詞 常見的幾種時態(tài)的被動語態(tài)的句型。 ,如果需要,就放在 by的后面,要變成它相對應(yīng)的賓格形式,如果不需要,可以省略。注意be動詞要按新的主語的人稱和數(shù)的變化而改變。 7. eg:Thousands of beaches are polluted. 情境引入