as well 可以直接用于just后，用作應(yīng)答語(yǔ)（可視為It's just as well、的省略），作“幸虧，幸而；無妨；沒關(guān)系”解。
例句：
We might as well finish up the cake.
我們倒不如把蛋糕吃完。
She doesn't play as well as her sister.
她演奏得不如她姐姐。
Anyway, you're here; you might as well stay.
無論如何你已在這里，你就留下來吧。