Only that引导的从句,汉语常可译为“要不是、倘若不是”。据笔者观察,其用法特点一般是:1)only that从句一般相当于一个由if…not引导的非真实条件状语从句。2)only that从句中用陈述语气,而主句中一般用虚拟语气。具体来说,如条件句是假设过去,only that从句谓语动词一般用过去式,而主 Only that guide clause, Chinese can often be translated as “If not, if not.” According to the author’s observation, its usage characteristics are generally: 1) only that clause is generally equivalent to a non-real conditional adverbial clause guided by if...not. 2) Only that clause uses a statement tone, and the main sentence usually uses virtual tone. Specifically, if the conditional sentence is the hypothesis of the past, only that clause predicate verb is generally used in the past tense, and the main