今日は○○が（オンライン英会話）をやります。って英語でなんて言うの？

"(name) will be taking the lesson today" This is an acceptable way to inform the teacher as to which of your sons will be in class. "(name) will be in attendance in today's class." In attendance = This is a formal way of saying someone will be coming to a meeting/class. "For today,(name) will be coming to class" This is another good way of specifying which of your sons will be in class.

▪ "Yuri" will be doing the lesson today. This is telling the teacher that "Yuri" will be doing the lesson today. ▪ Today's lesson will be attended by "Yuri". Attend = to be present for the lesson. This is saying that "Yuri" will be taking the lesson today.

*(name) will be attending the class today. Attending means to come for the class.." For example: "Shuan will be attending your class today.' *You are going to have (name) for your lesson today. Since the teacher is aware of this arrangement you can say it in a casual way. For example: "You are going to have Shuan for your lesson today."

You can inform the teacher who will be taking the lesson today in these two ways. By saying you will be seeing (name) today makes it more casual. Both phrases are polite and informative. To make it even more simple, you can say, "It will be (name) today". This is really casual but acceptable to use.

If this is an habitual process, then it may be interesting to think of alternative ways of heralding the imminent lesson with little Johnny. A humorous way would be to mimic the words of Jack Nicolson in the Shining: "Here's Johnny!" Of course the name may be adapted to anything: "Here's Sarah!"

The first phrase, "Today, you will be teaching..." is the best way to inform the teacher who their student will be in a short and effective way. Both phrases perform the same function, but using different grammatical structures. I hope this helps.

Here, I used "Yuta" as an example in which the two brothers are Yuta and Hiro. If you wish to indicate that it will be Yuta taking the class, you can use any of these three sentences. The grammar is different in each case, but they all have exactly the same meaning. All three examples are acceptable and show good manners. The teacher will find any of the above sentences to be helpful.