英语语法中有16种时态，包括现在简单时态、现在进行时态、现在完成时态、现在完成进行时态、过去简单时态、过去进行时态、过去完成时态、过去完成进行时态、未来简单时态、未来进行时态、未来完成时态、未来完成进行时态、过去未来简单时态、过去未来进行时态、过去未来完成时态和过去未来完成进行时态，每种时态都有其特定的用法和语法形式。
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现在简单时态（Simple Present Tense）：表示经常发生的动作或客观真理。如：I eat breakfast at 7am.
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现在进行时态（Present Continuous Tense）：表示正在进行的动作。如：I am eating breakfast right now.
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现在完成时态（Present Perfect Tense）：表示发生在过去但与现在仍有联系的动作。如：I have eaten breakfast already.
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现在完成进行时态（Present Perfect Continuous Tense）：表示从过去某一时间开始一直持续到现在的动作。如：I have been eating breakfast for 30 minutes.
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过去简单时态（Simple Past Tense）：表示过去某一时间发生的动作。如：I ate breakfast at 7am yesterday.
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过去进行时态（Past Continuous Tense）：表示过去正在进行的动作。如：I was eating breakfast at 7am yesterday.
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过去完成时态（Past Perfect Tense）：表示过去某一时间之前已经完成的动作。如：I had eaten breakfast before I went to work.
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过去完成进行时态（Past Perfect Continuous Tense）：表示过去某一时间之前一直持续到那个时间的动作。如：I had been eating breakfast for 30 minutes before I went to work.
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未来简单时态（Simple Future Tense）：表示将要发生的动作。如：I will eat breakfast at 7am tomorrow.
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未来进行时态（Future Continuous Tense）：表示未来某一时间正在进行的动作。如：I will be eating breakfast at 7am tomorrow.
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未来完成时态（Future Perfect Tense）：表示未来某一时间之前已经完成的动作。如：I will have eaten breakfast before I go to work tomorrow.
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未来完成进行时态（Future Perfect Continuous Tense）：表示将来某一时间之前一直持续到那个时间的动作。如：I will have been eating breakfast for 30 minutes before I go to work tomorrow.
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过去未来简单时态（Future in the Past Simple Tense）：表示过去某一时间预计将要发生的动作。如：I thought I would eat breakfast at 7am this morning.
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过去未来进行时态（Future in the Past Continuous Tense）：表示过去某一时间正在进行的动作。如：I thought I would be eating breakfast at 7am this morning.
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过去未来完成时态（Future in the Past Perfect Tense）：表示过去某一时间之前已经完成的动作。如：I thought I would have eaten breakfast before I went to work this morning.
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过去未来完成进行时态（Future in the Past Perfect Continuous Tense）：表示从过去某一时间开始一直持续到另一个未来时间的动作。如：I thought I would have been eating breakfast for 30 minutes before I went to work this morning.
