Determine the goal of the lesson. An appropriate lesson for a second grader can include learning to pronounce words with silent letters, or linking multisyllabic words together through sounding them out.
Decide what is an appropriate expectation for a second grader to achieve after completing this particular phonics lesson. If the student should be able to sight read words with a silent letter in them, then the behavioral objective can include the phrasing "the student will identify the silent letters in words and enunciate them correctly when reading aloud."
Include one to two behavioral objectives for each phonics lesson. A second grade level lesson should not include too many objectives in one lesson so as not to overwhelm or discourage the student.