Explanations, structures, exercises and examples of the zero, first, second, third and mixed conditionals in English. Ideal for learners who need to review when and how to use these structures.
解释,结构,练习和零,第一,第二,第三和混合在英语条件句的例子。非常适合学生需要审查世卫组织何时及如何使用这些结构。