During speaking lessons, students are sometimes interrupted by teachers to correct the grammatical mistakes resulting in a lot of harm to the fluency of speakers.
It is advisable not to, though I know that we in education find it difficult not to do so. Beside limiting the students' opportunities of learning by performing with an inter-language, interruptions usually occasion psychological damage to the motivation and fervor of students to speak. However, attention to grammar may be pointed out generally to a group of students, without addressing a particular student with his/her grammar mistakes. When they are addressed this way, students usually keep self-confidence in their capacity to perform with competence and also confidence in us as their tutors.
As a teacher, it's difficult to tolerate the mistakes made by students especially during speaking; however, the interruptions may sometimes cause problems for the students so that they couldn't continue. So, at the beginning of speaking activities, I usually ask my students whether or not they are at ease with interruption. For those who don't prefer to have interruptions, I note down the mistakes and let them know about them after their turn finishes.
I do agree with you, Laya. Noting down the students' mistakes and discussing them with their colleagues after the speaking turns is a good idea to avoid interruptions. Best regards. Hazim