Here is a challenge for you: use the Question Formulation Technique in an English classroom. In essence, the teacher gives the students a question focus, the students produce, improve and prioritise their questions; then together they decide on next steps (research, presentation) and reflect on what they have learned. It’s explained in greater detail in the article; if you need more, there is a whole website about ‘asking the right questions’.
I can see how it can work with a grammar point or a collocation, or perhaps a semantic field. Or we could simply use the language as a tool and focus on non-linguistic topics, do a class survey or a web quest. The best part is that the students get to take active ownership of their learning and begin to think like researchers. What do you think?