別為過去傷心，也別對未來過早微笑 「幫忙翻譯正確英文」謝謝?

Pain not thyself for what is in the past.
Cheer not, also, for what is in the offing.

Don't be sad for what has already past;
Don't smile for the future too early.

以上是直譯你的句式。
建議
"be sad"可改作"cry"(意思是別為過去哭喪)
"smile"可改作"cheer"(意思是高興/喜迎未來)

It's too late to cry for the past.
And it's yet premature to smile to the future.
對過去傷心為時已晚，對未來微笑為時尚早。