只剩下回忆和过去翻译成英文

Only the memories and the bygone remain.
"remain"在这里使用一般现在时会更合适一些，
或者
The only left things are the memories and byone.
或者
It only left the memories and the bygone

Only leave the memory and the past

What remaining is just memory and past.

the memory and the past has been lerve !

The only thing left is the memory to the past.

Only the memories and the bygone remained

memories: memory的复数

bygone：往事，过往。 bygone复数也是bygone