it’s supposed to be

“it’s supposed to be” 这个固定搭配通常用来表示某事物被期望、假定或认为应当是某种方式。

 It’s supposed to be sunny today. 今天应当是晴天。

It’s supposed to be cold tomorrow, so don’t forget to wear a coat. 据说明天会很冷，所以别忘了穿外套。

The meeting is supposed to be over by 3 PM. 会议应该在下午3点结束。

The book is supposed to be based on a true story. 这本书据说是根据一个真实故事改编的。

as … turn to … 

as the days turned to weeks and the weeks to months 随着日子变成几周，几周变成几个月

as his months at the work turned to years 随着他工作的几个月变成了几年

在这些例句中，”turned to“被用来描述时间的流逝。这种用法在叙述中很常见，用来营造一种时间推移的感觉。