I believe most primary school lesson have to be student-centred. But it does not mean that every part of the lesson has to be student-centred. We, actually, have to maintain some particular parts teacher-centred. 

The key to student-centred lesson is the student's expression. Whether or not students are given a chance to speak or write down their own expression is where difference between student-centred and teacher-centred lies.

 In order to pull out student's expression, teachers must have students deeply engaged and well prepared. And to do so, teachers may have to explain a lot and clearly. That part has to be absolutely teacher-centred. Teachers must confidently have teacher-centred parts in the early stage of their lessons in order to clearly direct students to forge their own expression. It is found in many classrooms that teacher asks many questions to let students answer, then teachers believe it is student-centred. But it is not. Students might be trying to make some conversation with the teacher because they have to. That would end up with the typical classroom conversation of "Is that clear? - Yes" or "You understand? - Yes." or "Any questions? - No".

 We must emphasise that the Chalk-Talk style teaching has nothing wrong with student-centred lessons. In fact, most teachers who are very good at performing student-centred lessons happen to be extremely good at Chalk-talking. Simply, because they know how they explain and lead students to the learning objectives. In other words, they know exactly what they are teaching. I believe all teachers should have strong Chalk-talking skills.