1) 在含有宾语从句的主从复合句中,如果主句是过去时态,从句的谓语动词要用过去时态的某种形式;如果主句谓语动词是现在时态,从句的谓语动词可根据实际情况而使用某种时态;如果从句表达的是客观事实或真理,谓语动词必须用一般现在时。如: 2) 状语从句的时态比较复杂,我们应注意以下几点:①主从句的时态要一致;②主句是一般将来时或祈使句,条件状语从句或时间状语从句要用一般现在时表示将来;③表示过去的一个动作发生时,另一个动作正在进行,这时从句用过去进行时,主句用一般过去时。如: 有时句子没有明显的时间状语,也不能用时态呼应规则来对照,这时就可以根据上下文的内容来判断时间关系,确定时态。如: 1. Do you know where Helen ______ (1ive) now? 2. The teacher told us the earth ________ (go) around the sun. 3. She wanted to know if her grandmother________ (1ike) the present. (解答:1. lives 2. goes 3. liked) 1. We will go to the park if it ________ (not rain) tomorrow. 2. Could you give me a call as soon as she______ (arrive)? 3. I ________ (meet) an old friend of mine when I ______ (walk) in the street yesterday afternoon. (解答:1. doesn't rain 1. Be quiet! The girl ________ (1isten) to the radio. 2. While Amy ________ (play) in the garden, her brother ________ (write) in the room. 3. —I have bought a CD. —When ________ you ________ (buy) it? (解答:1. is listening 2. 2. arrives 3. met, was walking) is / was playing, is / was writing 3. did, buy) 二、确定语态 我们在考虑时态的同时,也要考虑语态。当句子的主语是谓语动词动作的承受者时,用被动语态;反之用主动语态。如: 注意:不及物动词或相当于不及物动词的短语动词(如:listen, sleep, happen, get up, grow up, break out, come in等)没有被动语态形式。如: 但是,当“不及物动词+介(副)词”构成的短语动词其作用相当于及物动词时,则有被动语态形式。如: 1. Yesterday I ________ (tell) that we would have a picnic on the beach. 2. Now basketball ________ (enjoy) by people all over the world. (解答: 1. was told 2. is enjoyed) The plane has disappeared. The war broke out many years ago. The children are looked after well in the school.