Tôi bắt đầu nghiêm túc suy nghĩ kỹ

Tôi bắt đầu nghiêm túc suy nghĩ kỹ về việc kết hôn với bạn gái của mình lúc đó ( người sau này trở thành vợ tôi)

Results (English) 1:

I started seriously thinking about getting married to his girlfriend at the time (who later became my wife)

Results (English) 2:

I started to seriously think twice about marrying his girlfriend at the time (who later became my wife)

Results (English) 3:

I began to seriously consider the matter of marriage, my then girlfriend (he later became my wife)