1.divide / separate
divide和separate两个词都有“分开”的意思,但在使用上存在着较大的差别。divide表示把某物分成若干个等份,常与into连用；而separate表示“使……分离；别离；分手”,常与from连用；此外,separate还可以作形容词,表示各自的,如go on separate holidays。
Let’s divide the cake into three.我们将蛋糕分成3份吧。
We divided a bag of cookies between us.我们把一袋小饼干分了。
The teachers divided on the point.老师们在那个观点上意见分歧。
He separated the good beans from the bad ones.他把好豆和坏豆区分开来。
All his family got separated during the war.他一家人在战争期间被拆散了。
The word has two separate meanings.那个词有两个不同的意思。

2. perhaps / possibly / maybe / probably / likely 都可以表示可能性，但在程度和用法上稍有不同。
1) perhaps作“或许”解，，它和possibly相似，但possibly通常与can, may, must 等连用。
Perhaps it is true./ It may possibly be true.这也许是对的。
2) maybe与perhaps意思相近。但比perhaps更为普通而语气较弱。
3) probably 可能性最大，相当于more likely
He will probably succeed.他很可能成功。
4) likely 比probable 更为多用。likely之后常与不定式连用，而且主语是人时也用likely,而probable没有这种用法。如：
He is likely to come here tonight.他今晚可能要来这里。
It is likely / probable that he will come here tonight.