真实条件句用于陈述语气，假设的情况可能发生，其中 if 是如果的意思。
时态关系句型：条件从句+主句一般现在时shall/will + 动词原形
e.g., If he comes, he will bring his violin.
e.g., The volleyball match will be put off if it rains.
It is time we had a rest.
I was wondering if you would let me use your car.
How I wish I had gone there with you!
初二下册英语电子课本I would be there by now if I had started earlier.2. be-subjunctive be-型虚拟式Simple sentences: only one clause Subject + Predicate (phrases) E.g., The sun was very hot.1). In certain that-clause: that从句中 用 (should)+ 动词原形表示虚拟语气的结构It is commonly used in that-clauses to express a command, decision, suggestion etc. After such verbs动词 as decide, decree, demand, insist, move, order, propose, recommend, request, suggest, vote, etc. (in object clause) After such adjectives形容词 as advisable, appropriate, desirable, essential, fitting, imperative, important, impossible, necessary, obligatory, proper, etc. (in subject clause) After such nouns 名词as decision, decree, demand, instruction, order, requirement, resolution, etc. (in appositive and predicative clauses)e.g., He suggests that students (should) learn something practical.2). In certain adverbial clauses 状语从句( of condition, of concession, and of purpose)e.g., If this rumour (should) be true, we cannot remain here.3). In certain formulaic expressions 公式化搭配(to express a wish, prayer, curse, etc.) (p. 186)e.g., Far be it from me to … Suffice it to say that …3. Were-subjunctive were-型虚拟式1). In certain adverbial clauses：Introduced by if, if only, as if, as though, though, etc., to denote an unreal condition or concession.e.g.: If I were you, I should wait till next week.2). In certain nominal clausesafter verbs like wish, would rather, suppose, imagine, etc., to denote a hypothetical situation.e.g.: I wish it were spring all the year round.