二、时态:学习名词性从句时,主从句动词的时态一致。
1.在宾语从句中,当主句是一般现在时,宾语从句可以根据需要用各种时态。如: Mary says that Tom isn’t lazy. Tom is doing well in his lesson. She will ask Tom some questions. Tom may fall behind the others. She missed us very much. She was writing a letter. She would visit the Great Wall. She said that
2. 如果主句谓语动词是一般过去时,则宾语从句须用过去的某种时态。如:
3. 如果宾语从句表示的是客观真理,其谓语动词则仍用一般现在时。如:
(1) The teacher said that light travels much faster than sound.
(2) The old man said the sun rises in the east and sets in the west. 三、几组易混引导词的区别。 (1) What 与 that
在句词性从句中,what和that都可作关连词,其区别在于:what在从句中要充当某个成分(主语、宾语或表语等),因此在任何情况下都不能省略,表示“什么”,所…的事(物、话),相当于the thing that或which。that本身没有词汇意义,在名词从句中不充当任何成分,在口语和非正式文体中,宾语从句中的that经常省略。如:
(1) What you have done might do harm to others.
(2) What caused the accident is a complete mystery .
(3)I think (that) you will like the stamps. 2、whether与if
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