it 作形式主語的句子結(jié)構(gòu)是 It‘s ...for sb to do sth所以這句應(yīng)該改為 It's necessary to tell your father the truth.That the police keep order in an important football match is a hard job 轉(zhuǎn)換成用it 作形式主語。I think it is important to master a foreign languageHe felt that it was his duty to help the poorI find that it's no good trying to persuade him這3個(gè)轉(zhuǎn)換成用it作形式賓語The football match had to be put off because of the bad weather 轉(zhuǎn)換成對(duì)畫線部分進(jìn)行強(qiáng)調(diào)。because of the bad weather是畫線的It's a hard job for the police to keep order in an important football match.形式賓語的結(jié)構(gòu)差不多只是少了be動(dòng)詞 即 think/find/feel等動(dòng)詞+it+...+to do sth.朋友要自己按照框框去套 這樣才能成為你自己的哦I think it important to master a foreign language.He felt it his duty to help the poor.強(qiáng)調(diào)句的結(jié)構(gòu)是It's+被強(qiáng)調(diào)部分+that/who+其他當(dāng)然這個(gè)句式不能用于強(qiáng)調(diào)謂語動(dòng)詞It's because of the bad weather that the football match had to be put off。