Translation:My wife was in Beijing last week.
I was watching a chinese learning video on youtube and the lady said that you NEVER put the time AFTER the verb, like we do in English.
It can be either before or after the subject [in this case my wife]. She said they usually only put time first if you are really stressing the time... like NOT this week...LAST week.
So it would be Subject+Time+Verb+Object in this sentence.
Hope that helps you, it certainly helped me! https://youtu.be/4U8POm5OfGg