求這兩句意思

先說"then"一般是指"那時"(從前)，用法可以多變地插在子句中或放在句尾作為附加表示所講的事時間上的意義。

這兩句都是用在問句和講及過去回憶曾經的"那時"意思。

1. Could it have been...本身是自問"某事(it)是否曾經/已經是...如何如何
在這問句式附加then是指"過去那時"，所以全句意思或結構是想反問自己從回憶出關於自己"戀愛了"的那刻：

是否在那時我自己開始發覺是在戀愛了呢？

2.
是否從那時起你便決定成為一個律師。

1）

它本來可以然後我第一次意識到我戀愛了嗎？


2）

是它然後你決定成為一名律師嗎？

(1)"then" is an adv. used to refer to a particular time in the past;
eg:-In the eg:-
main clause
=It could have been first realized;
and the subordinate clause
=I was in love then.
=(then) refered to a particular time in the past.
Other ways of writing:-
eg:-"Love" was then realized by me.
eg:-I realized "love" as it then was.
eg:-I realized I was in "love" then.

(2)was it then=refer to a particular time in the past in question form.
eg:-Was it (at that particular time )that you decided to become a lawyer ?