When I teach something new, I’m always worried about one simple thing. Will my students internalise any time soon the new “whatever it is”? How can I help them? How long does it take for them to feel confident using the new structure/expression/word? How many times do they have to be exposed to the new term? How many different examples/contexts do you have to give them? How long does it take before a word becomes familiar and therefore usable?
This is an article I wrote for Voices, the British Council magazine, where I suggest Six Low-Preparation Vocabulary Activities for the English Classroom, which can help.