句子改错(英语)

looking back at my life, it seemed to me that childhood is my most memorable period.

这个肯定正确。

Looking back my life, it seemed that the most memorable is childhood.

有一些词是不能连在一起的，memorable peorid 基本没办法解释。

为了保留原意，我想childhood改动一下就可以了。
即Looking back over my life, it seemed to me that the most memorable period is the period of childhood.

Looking back over my life, it seemed to me that the most memorable peorid is my childhood.
必须有个名词来限定童年