句型1:It+be+(not)long+before...此句型为before引导的时间状语从句,表示“没过多久就……/过了好久才……”。此句型的主句若是将来时,before引导的时间状语从句则要用一般现在时代替将来时;如果主句是过去时,那么before引导的时间状语从句也用过去时。此处表示时间的 Sentence 1: It + be + (not) long + before ... This sentence type is a time precedent adverbial clause, which means “not long before ...... / after a long time ...”. If the main clause of this sentence type is in the future, the time-based adverbial clause of before will use the general current time instead of the future time. If the main clause is the past, then the time-guided adverbial clause of the before is also used as the past tense. Here is the time