Only then did he realize that he had lost..
only then 开头的句子要倒装,也就是要跟一般疑问句形式.
He realized that he had lost .变一般疑问句就是 did he realize that he had lost.
过去时变一般疑问句要借助助动词did ,动词过去式变原形.
Only then did he realize that he had lost..
only then 开头的句子要倒装,也就是要跟一般疑问句形式.
He realized that he had lost .变一般疑问句就是 did he realize that he had lost.
过去时变一般疑问句要借助助动词did ,动词过去式变原形.