题目内容
20．Becomingforgetful is probably a sign of getting old．（forget）分析 变得健忘可能是变老的一个标志．
解答 答案：forgetful．这里的become是系动词，后加形容词构成系表结构，再者根据句意这里是说是变老的一个标志，故是变得健忘了，forget是动词忘记，后加ful构成形容词，故答案是forgetful．
点评 本题是通过系表结构得出空格处的词性，动词转化成形容词的规则也要掌握
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