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6．So far the boys have be able to swim across the river．be改為been．

分析到目前為止，這些男孩子已經能夠游過河了．

解答答案：be 改為 been．考察現在完成時的謂語動詞．根據時間狀語So far 可知謂語動詞用現在完成時have done，所以 be 改為 been．

點評考查句子改錯．
現在完成時的用法：
（1）強調動作是從過去持續到現在，并有可能繼續持續下去．
（2）強調對現在的影響或結果，此用法容易和一般過去時混淆．兩者的區別是：一般過去時有動作發生的時間點，即過去某一時間發生某一動作；現在完成時則沒有，即不強調是哪個時間點發生的動作，而強調過去的動作對現在造成的影響和結果．
（3）在過去不確定的時間里發生的動作，但是結果對現在有影響．

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