Praise and lots of it. Some really insightful comments from my year seven class on the poem Upon Westminster Bridge. They understand the relationship between the sonnet form and the meaning of the poem.
Really surprising comment from one of the pupils that the last word of each line of the second stanza make sense by themselves:
steep hill/deep will/asleep still/
The use of sincere and specific praise has given this class the confidence to start putting forward more ideas.