Confusing English: within vs by (Differenza tra WITHIN e BY - Inglese per seam Cambridge)

The video tutorial explains the differences between the prepositions 'within', 'in', and 'by'. 'Within' and 'in' are used for periods of time, while 'by' is used for precise times or moments. Examples are provided to illustrate the correct usage of each preposition, helping learners understand their distinct meanings and applications.

How would you correct the sentence: 'I have to complete the report within tomorrow'?

What is a common mistake people make when using 'within' and 'by'?