免得 (miǎn de): เพื่อไม่ให้

You'd better finish your homework now, so as not to stay up late and affect tomorrow's class.

Take an umbrella before going out, so as not to get wet if it starts raining halfway.

Let's book the restaurant in advance, so as not to find no seats on the weekend when it's crowded.

The doctor advised him to eat less greasy food, so as not to increase the burden on his stomach.

Back up the important files, so as not to cause trouble if the computer breaks down.

Please set your phone to silent during the meeting, so as not to disturb others when they speak.