simple present tense 简单现在时simple past tense 简单过去时simple future tense 简单未来时simple past future tense 简单过去未来时present continuous tense 现在进行时past continuous tense 过去进行时future continuous tense 未来进行时past future continuous tense 过去未来进行时present perfect tense 现在完成时past perfect tense 过去完成时future perfect tense 未来完成时past future perfect tense 过去未来完成时present perfect continuous tense 现在完成进行时past perfect continuous tense 过去完成进行时future perfect continuous tense 未来完成进行时past futur
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