改主動語態(tài)為被動語態(tài)：

People are still cutting down too many trees in the USA.

答案：
解析：

　　答案：Too many trees are still being cut down in the USA.

　　解析：顯然這句話要改為現(xiàn)在進(jìn)行時的被動語態(tài)。cut down是詞組不能分開或缺少�，F(xiàn)在進(jìn)行時的被動語態(tài)的構(gòu)成形式為：be＋being＋pp. 其中前面的be為am, is, are, was, were.

　　拓展延伸：根據(jù)以上例題的講解，為方便同學(xué)們記憶，我們把各種時態(tài)的被動語態(tài)編為一個口訣如下：

　　pp前面各種be; am, is, are現(xiàn)在時；was和were表過去；將來，情態(tài)不變be；完成have(has)been；進(jìn)行時態(tài)兩個be，前表時態(tài)后加-ing.


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