关于英文对话中的主语和动词的顺序

关于英文对话中的主语和动词的顺序
在新概念三中第二课,vicar和grocer的对话,全是answered Bill.said the vicar,asked the vicar in surprise.主语和动词的顺序是倒装顺序,而在十一课中的一问一答,全是主词加动词,正常顺序,我想问一下,什么时候用倒装,什么时候用正常语序.
还是这两种顺序自己可以随意使用.
第二课
I'm trying to repair the bell,' answered Bill.' I've been coming up here night after night for weeks now.You see,I was hoping to give you a surprise.'
You certainly did give me a surprise!' said the vicar.'You've probably woken up everyone in the village as well.Still,I'm glad the bell is working again.'
That's the trouble,vicar,' answered Bill.'It's working all right,but I'm afraid that at one o'clock it will strike thirteen times and there's nothing I can do about it.'
We'll get used to that Bill,' said the vicar.'Thirteen is not as good as one but it's better than nothing.Now let's go downstairs and have a cup of tea.
第十一课
'Have you anything to declare?' he asked,looking me in the eye.
'No',I answered confidently.
'Would you mind unlocking this suitcase please?'
'Not at all,' I answered.
'Perfume,eh?' he asked sarcastically.'You should have declared that.Perfume is not exempt from import duty.'
'But it isn't perfume,' I said.'It's hair gel.' Then I added with a smile,'It's a strange mixture I make myself.'
As I expected,he did not believe me.
'Try it!' I said encouragingly.

对比之下,可以看出
用人称时,用正常语序－－－I said,he asked
非人称时,如人名或称呼 ,动词 可以置后－－－
”Here is your hat" said Tom.不过,不一定要置后,