Deduction & Speculation Exercises PDFSet 1: Must & Can't: Present Deduction Exercises
20 questions·12 min·Answers included·Explanations included
Preview: Questions
Fill in the blank with the correct option.
1.Sarah has been studying all day without a break. She ___ very tired.
a) can't beb) must bec) should bed) has to be
2.James always gets the highest marks in every exam. He ___ very intelligent.
a) must beb) shouldn't bec) can't bed) won't be
3.It's 3 a.m. and all the lights are off in the house. Everyone ___ asleep.
a) has to beb) shouldn't bec) must bed) can't be
4.Maria always wears designer clothes and drives a luxury car. She ___ very wealthy.
a) can't beb) won't bec) should bed) must be
5.He speaks five languages fluently. He ___ love learning languages.
a) can'tb) mustc) shouldn'td) won't
... and 15 more questions in the PDF
Preview: Answers
1.must be
2.must be
3.must be
4.must be
5.must
... and 15 more answers in the PDF
Preview: Explanations
1."must be"(b)
Use 'must be' to make a strong deduction based on evidence. Sarah studied all day, so we can logically conclude she is very tired. 'Has to be' expresses obligation, not deduction. 'Should be' gives advice or expresses expectation, not a logical conclusion.
2."must be"(a)
Use 'must be' when evidence leads to a strong logical conclusion. Getting the highest marks consistently is strong evidence of intelligence. 'Can't be' would express the opposite — that it's impossible.
3."must be"(c)
Use 'must be' for a logical deduction from evidence. At 3 a.m. with all lights off, we can logically deduce everyone is asleep. 'Has to be' expresses obligation or necessity, not deduction.
4."must be"(d)
Use 'must be' when you see strong evidence and draw a logical conclusion. Designer clothes and a luxury car are strong indicators of wealth.
5."must"(b)
Use 'must + base verb' for a strong deduction. Speaking five languages fluently is strong evidence that someone loves learning languages. Note: must is followed directly by the base verb, not 'must to'.
... and 15 more explanations in the PDF
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