英语的八种常用时态及其结构和例句如下：
一般现在时 结构
：主语 + 动词原形（第三人称单数时加 -s）
例句 She reads a book every day. They often play football on weekends. 一般过去时
结构：主语 + 动词的过去式
例句 I visited my grandparents last summer. They played chess yesterday afternoon. 现在进行时
结构：主语 + am/is/are + 动词的现在分词（-ing形式）
例句 We are studying for the exam right now. They are playing basketball in the park. 过去进行时
结构：主语 + was/were + 动词的现在分词（-ing形式）
例句 I was cooking dinner when you called. They were watching a movie when I arrived.现在完成时
结构：主语 + have/has + 动词的过去分词
例句 I have finished my homework. They have been studying for hours. 过去完成时
结构：主语 + had + 动词的过去分词
例句 She had already left when I arrived. They had finished the project before the deadline. 一般将来时
结构：主语 + will + 动词原形
例句 We will travel to Japan next year. They will attend the conference in Paris. 过去将来时
结构：主语 + was/were going to + 动词原形
例句
He said he would visit me next week.
She told me she would go to the beach over the weekend.
这些时态在英语中非常常用，掌握它们有助于更好地表达时间和动作的关系。建议通过大量的阅读和写作练习来巩固这些时态的使用。