Our English teacher has a sense of humour and this is why his class is very popular with students.
楼下语法错误,应该是of great humour.这里要用名词,不用adj.
It is because our English teacher is humorous that his lessons are popular.
our english teacher has a sense of humour, that's why he is popular with us.
Our English teacher is of great humourous and that's why his classes are popular with us students!