托福(toefl)語法技巧:句子的時態比較和統一
時態的比較:
時態的比較一般指的是動作或狀態發生的先後。
過去時比現在時先發生:
例句:1. Jack built a path last year, and now he builds a house. [動作]
2. Mr. White was a worker years ago, and now he is an engineer. [狀態]
完成時要比一般時先發生:
例句:Tom said that he had done his work already.
現在完成時與過去時不能比較,因爲完成時指的是範圍,而過去時指的是時點。
將來時比一般時晚發生:
例句:The mother told us she would prepare the dinner early tomorrow.
時態的統一:
同一句子裡的兩個謂語要保持邏輯上的統一。但儅提到客觀真理時,可以不琯這些,直接用一般現在時。
例句:1. Mary said that she wanted to have a look at the picture.
2. They found that the house would be too small soon.
3. The professor told me that the earth is a planet of the sun.
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