1、Some time ago ,however,a peculiar fish was caught near Madagascar.however 可以放在句首吗?英语当中类似副词的位置,总是让我很纠结……2、It is now known that many of these 'monsters' which have at times been sighted are si

1、Some time ago ,however,a peculiar fish was caught near Madagascar.however 可以放在句首吗?英语当中类似副词的位置,总是让我很纠结……2、It is now known that many of these 'monsters' which have at times been sighted are si
1、Some time ago ,however,a peculiar fish was caught near Madagascar.however 可以放在句首吗?
英语当中类似副词的位置,总是让我很纠结……
2、It is now known that many of these 'monsters' which have at times been sighted are simply strange fish.
at times 放在 have 前或者放在句尾,→ at times have been sighted are……；have been sighted are simply strange fish at times.

1、Some time ago ,however,a peculiar fish was caught near Madagascar.however 可以放在句首吗?英语当中类似副词的位置,总是让我很纠结……2、It is now known that many of these 'monsters' which have at times been sighted are si
一、关于状语的位置

状语的位置比起其他成分来,位置比较灵活.根据说话人态度,出现在首位表示强调、出现在中位（称作插入性状语）表示顺便提及,出现在末位表示补充说明.

1、同样都是原因状语从句,但是由于出现的位置不同,强调的意思上也有了一定的区别.比如：
首位：Because he was ill, John didn't attend the meeting. 因为约翰病了,所以他没有出席会议.
中位：John, because he was ill, didn't attend the meeting. 约翰因病没有出席会议.
末位：John didn't attend the meeting because he was ill. 约翰没有出席会议, 那是因为他病了.

2、同样是副词性短语,由于位置的关系句意也发生了一定的倾斜,比如：

首位：For the first time, the astronauts landed on the moon. （我想强调的是这是）第一次,宇航员登上了月球.
中位：The astronauts landed for the first time on the moon. 宇航员第一次登上月球.
末位：The astronauts landed on the moon for the first time. 宇航员登上了月球,那可是第一次.

3、状语从句和副词性短语都是如此,更何况是评注性的副词.如：

首位：
* (The book is expensive); however, it's worth it. 这本书很贵,却很值.
* (Some time ago), however, a peculiar fish was caught near Madagascar. 不久前,不管怎么样吧,马达加斯加岛附近捕到了一条罕见的鱼.
中位：
* (The first part was easy); the second, however, took hours. 第一部分很简单,第二部分比较而言就要费力了.
* He was now a boy only.他那时只是一个孩子.（now表示涉及到的时间）
末位：
* You don't mean it, now. 这话不会是当真的吧? （now表示感情语气）

二、几种状语的排列顺序

如果一个句子带有不同种类的状语,一般说来,其顺序是：地点、时间、原因、其他.必要的时候可以用逗号隔开,也可以出现在不同的位置,如：

Some time ago, however, a peculiar fish was caught near Madagascar.
However, some time ago, a peculiar fish was caught near Madagascar.
However, a peculiar fish was, some time ago, caught near Madagascar.
Some time ago, a peculiar fish was caught near Madagascar, however.
Some time ago, a peculiar fish, however, was caught near Madagascar.

三、基于上述分析,at times可以出现在一下不同的位置：

These 'monsters' have at times been sighted.
At times, these 'monsters' have been sighted.
These 'monsters' have been sighted at times.

四、中位状语的与各种动词的相对位置

1、动词be和表语之间：如He is always at home.
2、谓语动词前面：如He always get up early
3、第一个助动词（或其他动词）和其他动词中间：如He has always been studying late into night.

1. However 可以放在句首。
2.可以放在have前，但不能放在句尾。你可以用sometimes代替一下at times来读整个句子。
其实英语很多是靠语感，读的通就行，读的别扭就不行。