Don't be selfish; share your snacks with your friends.
別自私;把你的點心和朋友分享。
It was selfish of him to take all the credit.
他把功勞全拿走是很自私的。
My brother was selfish and didn't help with the chores.
我弟弟很自私,沒有幫忙做家事。
It is selfish to leave trash on the table after lunch.
午餐後把垃圾留在桌上很自私。