初三英语宾语从句问题,

初三英语宾语从句问题,
1.我想问特殊疑问句做宾语从句时,从句的语序是什么,我的英语老师说是主+谓 例：I want to know what you were doing at that time.可是我在练习上又看到了另一种：I don't know how to answer the question.那到底应该怎么样啊?
2.有一个题目是：My father received a letter from the police(surprise)是让我们运用“形容词+that从句”结构和所给单词改写句子 后面的答案是My father was surprised that e received a lettter from the police.但我看到一道题的另一个改写是这样Lily is worried that her dog has caught a cold 那到底那个surprised 和worried的前面是用was 还是用is啊?