Oasis= Oases

Let your parents be obeyed

On and off (মাঝে মাঝে) - It rained on and off all day.

used to show that you think or feel the opposite of what has just been stated: "I thought you said the film was exciting?" "On the contrary, I nearly fell asleep half way through it!" I'm not angry with you. On the contrary!

Once an ant was very thirsty. He went to the pond to drink water.

Once in a blue moon = কালেভদ্রে - He comes to his village one in a blue moon

one of my friends is a lawyer

One of my friends are a lawyer.   = One of my friends is a lawyer

One of the boys was absent yesterday. 

“One should do their duties.”

One should respect their parents.

One's health should be taken care.

Only Allah can help us. (Negative) =  None but Allah can help us. 

Open for all.  = Open to all.

Out and out = হাড়ে হাড়ে = He is out and out a gentleman.