直到1920年才开始有定期的无线电广播。

Not until 12 o”clock last night did Tom come back.（倒装句）

昨晚直到十二点汤姆才回来。

Until I was 20 I had never been away from my hometown.

我二十岁以前，从未离开过家乡。

2.An official report into the release from a Scottish jail of Abdelbaset al-Megrahi, a Libyan man convicted of blowing up an airliner over the town of Lockerbie in 1988, has concluded that Britain's last Labour government wanted him freed before he died and did all it could to secure his release.

这句话的主干是：An official report has concluded，后面是that引导的宾语从句，结论的具体内容。into the release是报告的对象。convicted of是过去分词作后置定语，修饰a Libyan man。