英语时态是表示行为、动作和状态在各种时间条件下的动词形式。英语中有16种时态，但中学阶段较常用的有十种。以下是这些时态的结构：

一般现在时

结构：主语 + 动词原形（第三人称单数时加 -s 或 -es）

例句：

She reads a book every day.

They are playing football now.

一般过去时

结构：主语 + 动词的过去式

例句：

He visited his grandparents last weekend.

They played tennis yesterday.

一般将来时

结构：主语 + will + 动词原形

例句：

I will travel to Japan next year.

She will finish her homework soon.

现在进行时

结构：主语 + am/is/are + 动词现在分词

例句：

They are studying for the exam right now.

She is cooking dinner.

过去进行时

结构：主语 + was/were + 动词现在分词

例句：

They were watching a movie last night.

She was reading a letter when I called her.

将来进行时

结构：主语 + will be + 动词现在分词

例句：

I will be working at the new branch next month.

She will be traveling in Europe in July.

现在完成时

结构：主语 + have/has + 动词过去分词

例句：

They have finished their homework.

She has lived here since last year.

过去完成时

结构：主语 + had + 动词过去分词

例句：

They had already left when I arrived.

She had finished her project by 5 pm.

现在完成进行时

结构：主语 + have/has been + 动词现在分词

例句：

They have been studying for three hours.

She has been running, and she is exhausted.

过去完成进行时

结构：主语 + had been + 动词现在分词

例句：

They had been walking for hours before they found the village.

She had been crying since she heard the news.

这些时态通过动词形式的变化来表示不同的时间条件和状态，是英语学习中的重要内容。建议在实际应用中结合具体语境和例句来理解和运用这些时态。