お茶を一口飲んでいいって英語でなんて言うの？

A "cup of tea" refers to a teacup with hot tea. It is typically offered when you have someone visiting your home and want to see if they would like something to drink. "Yes please" or "sure" would indicate that you would like a cup of tea. "No thank you" or "I'm ok" would mean that you would not like tea to drink.

You want to take a sip of tea. You want to tell your teacher that you will take a sip of tea. You use one of the above statements.

When you use the word "sip" it means to take a small taste of a drink. "I am going to take a sip of tea."

Would you mind if I grab my tea while it's still hot? In this context, grabbing something means doing it quickly or hurriedly. More examples: Let's grab a quick bite - Let's have something to eat quickly. I'm going to grab a nap - I'm going to take a quick nap. A nap is a short sleep. Would you mind if I have a sip of my tea? A sip means a slow, short taste of any beverage. Would you mind - this a a polite way of asking for permission before doing something.

Tea is consumed by drinking it because it is a liquid. However, it is not drunk the same way other liquids such as beer or juice are drunk, it is sipped because it is drunk while it's hot. It is drunk in sips. The word 'sip' operates both as a verb and as a noun. It has been used as a noun in the first and second statements, but, it has been used as a verb in the third statement. Say, when the lesson started, you were already drinking tea and had to carry on drinking it during the lesson, you may say to the teacher: I am drinking tea and I hope you don't mind me taking a sip teacher. or I just would like to take a sip of tea if you don't mind teacher. or I hope you don't mind me sipping some tea teacher.

When you want to tell your teacher that you will be having a sip of your tea during the lesson; then you may explain in the following ways: -I'm going to take a sip of tea. -If you don't mind; I'll be having my tea during the lesson.