I was reminded of this idea, whilst observing a lesson. A great starter is a quick quiz with up to 10 questions for students to answer. This helps students to remember what they were learning about in the last lesson and help them begin to make their framework for what they will learn in this lesson. It can also be a useful routine to set your expectations at the start of a lesson. You can adapt the quiz to cover several lessons, you can make it into a competition either as individuals or as teams. In MFL they do this less formally as they remind students of the vocabulary they were introduced to last lesson and then extend it further with the new ideas for the new lesson.