今日は授業はありますか？って英語でなんて言うの？

In order to ask your teacher whether or not you have a class, you can say: Do we have a class today? This is the simplest way of asking if you and your teacher will participate in a class, that is why the word 'we' is used. You can also ask: Will you be teaching me today? This is the same as asking if there will be a class. But this focuses more on the teacher teaching you. It has the same meaning but implies that possible you may have another class with a different teacher instead so you want to check. I hope that helps!

Do we have a class today? is an informal way of checking whether or not a lesson will be taking place and at what time. Please confirm the lesson will take place as scheduled today, is a more formal way of checking that your tutor has a class scheduled for you and that he/she will be conducting it on time.

in session - to be in session. This means that a group of people will be meeting for a conference or class. For example, this is an example message that a school or teacher can send to students when class is canceled: Dear students, Please be aware that due to impending weather conditions, class will not be in session this coming Tuesday. Normal school activities will resume on Wednesday. Stay inside, stay safe, and stay warm! Yours truly, Teacher/Principal X

Well, the important thing is to remain relaxed and give the teacher time to deal with any possible matters that may be causing the delay. Teachers are usually highly reliable and if they should be a few minutes late, there is probably a very good reason for that. If after a few minutes you do not receive a call, any of the above example sentences should encourage a response - if the teacher is present.

If it already past the the time that the teacher was supposed to call you to start the lesson, then it means that the teacher is late for some odd reason. It could be that the teacher has had internet connection problems, or, he has missed the class alerts and has therefore been unable to call you when the lesson time came. Whatever the reason may be for the teacher not to call you, you may ask him/her as follows: I see that it's already past the starting time for our lesson. Don't we have a class today? or It appears you are late for the lesson teacher. Will you be coming to class at all today?

When you ask the teacher 'do we have a lesson today?' it is a very safe question because sometimes maybe you got the time wrong and there is no lesson, or maybe the teacher cancelled some time ago and it is still not reflecting on your side. This way if the teacher replies 'no we do not have a class, I cancelled' then you can say 'okay, thank you, see you next time'. When you ask 'will you be showing up for class today?' you are VERY sure there is a class and you want to ask the teacher if she can make it to that class. Please note this is a risky question because you already assume you are 100% correct there is a class. Rather use the first question, it is more polite.