Read each fact about a museum object. Complete the sentence with the correct modal verb: must, can’t, may (not) or might (not). Use the clue in brackets to decide how certain the conclusion is.
1. A museum researcher is studying a handwritten letter. The paper, ink and handwriting style all match documents produced in Europe in the early 1800s. The letter date from that period.
(almost certain)
2. A museum curator notices small holes and marks on an old wooden box. Similar marks appear on boxes that once had metal decorations attached to them. The box have decorative metal pieces missing.
(possible, but not certain)
3. A ceramic plate is labelled as a 15th-century object, but researchers discover a factory mark on the base that was first introduced in 1924. The plate be from the 15th century.
(almost certainly not)
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