Question

20．這些志愿者在運(yùn)動會前接受培訓(xùn)是很有必要的．It's necessary for these volunteers to receive training before the sports meeting．．

Answer 1

分析 It's necessary for these volunteers to receive training before the sports meeting．

解答 答案：It's necessary for these volunteers to receive training before the sports meeting．這里是表示對某人來說做某事是怎么樣的用句型it is+adj+for sb+to do sth，it是這個(gè)句子的形式主語，真正的主語是to do sth．必要的形容詞necessary，這些志愿者these volunteers，接受培訓(xùn)receive training，故It's necessary for these volunteers to receive training，加上時(shí)間狀語在運(yùn)動會前 before the sports meeting．故答案是It's necessary for these volunteers to receive training before the sports meeting．

點(diǎn)評 本題要注意It is adj+for sb to do sth與 It is adj+of sb to do sth的各自的用法區(qū)別是
1）for sb．常用于表示事物的特征特點(diǎn)，表示客觀形式的形容詞，如easy，hard，difficult，interesting，impossible等：
　　 It's very hard for him to study two languages．對他來說學(xué)兩門外語是很難的．
2）of sb的句型一般用表示人物的性格，品德，表示主觀感情或態(tài)度的形容詞，如good，kind，nice，clever，foolish，right．
　　 It's very nice of you to help me．你來幫助我，你真是太好了．