他昨晚花了半个小时写这封信.的翻译：He had spent half an hour to write this letter. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

He spent half an hour last night writing this letter.

He had spent half an hour to write this letter.

He spent for half hour to write this letter last night.

Last night he had spent half an hour writing this letter.

He had spent half an hour to write this letter.