A131. ascertain

ascertain

构词：as（＝ad，to）＋certain（确定）

     “去搞清楚确定（动作）”

相关：certainly，certain，certificate，uncertain，concern，discern，assert

搭配：ascertain the truth／extent，ascertain＋that…

同义：assure，determine，to make sure

辨析：ascertain＝find out if it is true

      affirm，confirm＝show that it is true

      guarantee＝（doing sth.）to make sure that it is true

考点：表达过于绝对的问题