摘要：根据主从句的关系来确定时态. 4.根据语言习惯来确定时态 *e,go,leave 等趋向性动词的进行时可用来表示即将发生的动作. *2.永恒的真理和客观存在的状态用一般现在时. *3.祈使句中,或在情态动词,助动词后,谓语动词用原形 Don't in the sun , will you? You'd better at home since it's raining outside. 注意所填动词的语态 Today both basketball and volleyball in many countries. 确定动词的形式
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根据A句的内容完成B句，每空填一个词。
A．We should water the flowers every four hours．
B．The flowers should ________ ________ every four hours．
根据A句的意思完成B句，使两句的意思基本相同。每空限填一个单词。
A．Little Tom was too young to go to school．
B．Little Tom was not ________ ________ to go to school．
根据A句的内容完成B句，每空填一个词。
A．He arrived with a policeman shortly before nine．
B．He arrived with a policeman shortly before ________ ________ nine．