How do I know that they know?
Formative assessment is a guiding light for teachers to adjust instructional practices to support student achievement. Bridging the gap from one level to another can be smoother, purposeful and gel with student interests. Setting learning goals and measuring progress can take place at any time, multiple times during instruction. If a student knows where they are, what they need to do in order to get to a clear target - better results will happen!
Student output is the best part of teaching a world language...ask any WL teacher! Eventually achieving higher levels of comprehension can present itself in listening, writing, reading and speaking opportunities. It might feel like a continuous struggle for students to gain the level of success that they aim for - however output is celebrated in small and large scale successes throughout a class setting.