Core idea
An inference is a conclusion supported by clues. Tone is the writer’s attitude. Purpose is what the writer wants the writing to achieve.
Solving method
Separate what is stated, what must follow, and what is merely plausible. Tone comes from the author's attitude, not the topic's emotional weight.
Worked example
“The new library opens today. At last, our town has a quiet place to read!” What tone is suggested?
1. Look for words showing attitude: “At last” and the exclamation.
2. The writer welcomes the library.
3. A pleased or relieved tone fits better than an angry tone.
Read the diagram
The exclamation “At last!” suggests a welcome event. Together with the description of a quiet reading space, it supports pleasure or relief. The diagram tracks tone, rather than making a claim about the author’s purpose or guaranteeing every reader has the same reaction.
Exam-style application
Text: "The trial offers an encouraging start, although its small sample prevents a firm conclusion." Is the author dismissive, cautiously positive, certain, or indifferent? Encouraging rules out dismissive and indifferent; prevents a firm conclusion rules out certain. Cautiously positive fits both halves. You may infer that stronger evidence is needed, but not that a larger trial will necessarily succeed.
Common mistakes
Choose the smallest conclusion supported by the words, not a larger story you imagine. An inference cannot introduce a new cause, universal claim or future guarantee. Keep the strength of the answer no stronger than the evidence.