八过去完成时态：发生在过去的过去。
学习使用过去完成时态。
“我过去已经完成了”是过去完成时态的一个例句。
试用括号里动词的过去完成时态或一般过去时态来填充空格。
B. Fill in the blanks with the past perfect or simple past tense of the verbs in brackets.
海伦把钥匙忘到办公室里了，因此她不得不等她丈夫回来。对于过去完成时态练习题。
Helen had left her keys in the office so she had to wait until her husband came home.
现在完成时和过去完成时都属于完成时态。
The present and past perfect tenses both belong to the perfect tense.
英文摘要时态的运用也以简练为佳，常用一般现在时、一般过去时，少用现在完成时、过去完成时，进行时态和其他复合时态基本不用。
The use of tenses in English also is better to concise, commonly used present tense, the past tense, use less when completed, the past is finished now, tense and other composite tense basic need not.
英文摘要时态的运用也以简练为佳，常用一般现在时、一般过去时，少用现在完成时、过去完成时，进行时态和其他复合时态基本不用。
The use of tenses in English also is better to concise, commonly used present tense, the past tense, use less when completed, the past is finished now, tense and other composite tense basic need not.
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