有谁能帮我把这四个英语句子变成倒装句？请用到括号里的单词

有谁能帮我把这四个英语句子变成倒装句？请用到括号里的单词
1.he had never before seen such a technically accurate drawing of the building.（never before)
2.the housewife made her accusation and then the police took up her case .(only after)
3.it is seldom possible to have twins twice.(seldom)
4.you cannot go out to play until you have finished your project.(not until)