The singer had never performed in New York before.
这位歌唱家以前从未在纽约演唱过.
We had hardly started before [ when ] it began to rain.
我们刚出发,就开始下雨.
He could not remember where he had seen her before.
他记不起在什么地方见过她了.
It reminded me of the mistakes I had made before.
它使我想起了以前我犯的一些错误.