副词位置I suddenly think of my first love I think of my first lo

在这个句子中是可以随便用的,因为suddenly修饰的是这里的一个动词.修饰形容词的时候也拥有高度的随意性,例如：He was wounded heavily.He was heavily wounded.Heavily he was wounded.当然有些顺序并不推荐使用,例如heavily he was wounded,在文学著作中可以看见,但是现代人出于阅读流畅的关系希望看见这个描述形容词的副词靠近形容词.
但是,有的副词是不可以随便放的,我可以想到的是统领整句句子的副词（我不记得这个副词究竟叫什么名字了）,例如fortunately,frankly之类的.
Fortunately,I found back my keys.
Frankly,I have no idea what you were talking about.
这样的这个副词就必须得要置于句首.当然在口语中会比较的随便,可以是一句话出口然后想到要补一个副词,就像:I found back my keys!— Fortunately.