【正文】
動詞時其構(gòu)成:主語 +情態(tài)動詞 + be + 動詞的 .過去分詞 . The Passive Voice: 被動語態(tài) Exercises 用所給單詞的正確形式填空: 1)When was the telephone _____ (invent)? 2)The puter can ____ (help) us do math problems. 3)In those day, the woman couldn39。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 !