18．Today is my grandma'ssixtieth （sixty） birthday．

分析 今天是我奶奶的六十歲的生日．

解答 答案：sixtieth．
結(jié)合句意是說是第六十個生日，故用序數(shù)詞，sixty是基數(shù)詞"六十"，序數(shù)詞是sixtiety第六十，故答案是sixtieth．

點評 一、二、三，單獨記；八去t，九除e，ve要用f替，整十基數(shù)變序數(shù)，先把ty變成tie；要是遇到兩位數(shù)，十位基數(shù)個位序，th最后加上去．
解析口訣：one→first，two→second，three→third這三個詞變化特殊，要單獨記；eight→eighth，nine→ninth，八去t，九去e后再加-th； five→fifth，twelve→twelfth，五、十二把ve換成f再加-th；twenty→twentieth，thirty→thirtieth…整十先把詞尾y改為ie再加-th．兩位數(shù)時則十位數(shù)用基數(shù)詞，個位數(shù)用序數(shù)詞，如：twenty-first．

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