按等级分的语法
C1
C1 有 5 个题目。每个先讲规律，再给练习。
Mixed conditionalsHow do mixed conditionals work in English?Inversion after negative adverbialsWhen do you invert the subject and verb in English?Cleft sentences: it was… that, what… isHow do you use cleft sentences to emphasise something?Participle clausesHow do participle clauses work in English?It is said that… / He is said to…How do you use passive reporting structures in formal English?