this is not enough / this in incomplete
هيدا ما بيكفي
Hayda ma bekaffe (lebanese)

Whats happening
شو صاير
Shu saayir

Better
أحسن
Ahsan

Maybe
 يمكن / احتمال
yumkin/ ehthimael

Maybe he is outside
يمكن هو بره / احتمال هو بره
Yumkin hua barrah

Everybody knows about this 'subject/issue'
الكل بيعرف عن الموضوع
el-kel bya'aref an al-mawdhu'a