Inference is reading between the lines and looking at clues the author has given you (the reader) without explicitly saying it.
'Arnold was shaking violently, his knees trembling and a bead of sweat dripped down his forehead' - How is he feeling?
From his actions, you could assume he is scared or nervous. The writer hasn't told you this is how is feeling but has given you the clues you need to infer it!
TASK: Look at the inference challenge cards - can you use the clues in the pictures to answer the questions?