三、复合句，句套句，动词时态要呼应，习惯用法须记清。　
　
    例7．She didn't tell us_______________.　　

    A.how old the patient was 　　B.how old was the patient
 　　
    C.how old the patient is 　　D.how old is the patient
　　
    例8.-When will you tell him the good news? 　
　　
    -I will tell him about it as soon as he______________back. 　
　
    A.comes   B.came   C.will come     D.is coming 　
　
    例9.Do you know if_____________back next week?　If he_________back,please let me know.
　　
    A.he comes, will come      B.will he come, come

    C.he will come, comes　    D.will he come, will come 　
　
    例10.Our physics teacher told us light_____________faster than sound.
　　
    A.travelled 　B.has travelled     C.travels 　　D.will travel