For there to be so few people in the streets was unusual.

上句和There being so few people in the streets was unusual. 含义理解上“究竟”有何区别？

我理解是：

For there to be so few people in the streets was unusual. - 街上几乎没人很不正常。街上几乎没人是说话者脑海里想象的一种将来情况。

There being so few people in the streets was unusual. - 街上几乎没人很不正常。街上几乎没人是说话者当时看到街上的一种实际情况。

不知道我的理解对吗？

麻烦老师批评指正。非常感谢！