ｔｈｅｒｅｂｅ句型的非限定形式有以下四种情况,用时必须注意。１．当ｔｈｅｒｅｔｏｂｅ这种不定式结构用作句子的主语时,前面要用ｆｏｒ引导;如果用ｔｈｅｒｅｂｅｉｎｇ作主语,前面就不能再用ｆｏｒ引导。ｆｏｒｔｈｅｒｅｔｏｂｅ的位置较灵活,可置于句首也可置于句末,意 There are four types of unqualified forms of therebe sentence, and attention must be paid when using it. 1. When thereobe is an infinitive structure that is used as the subject of a sentence, it is preceded by the use of for; if therebeing is used as the subject, it cannot be preceded by for guidance. The position of foregroundebebe is more flexible and can be placed at the end of the sentence or at the end of the sentence.