I found this question in an exercise on modal verbs.

Find the mistake:

Yesterday; I think he travelled last week.

Where is the mistake and what does (yesterday & last week) refer to?

  • What is your thinking on it? I agree that it's confusing, but which part is confusing to you? – Jason Patterson Nov 8 '14 at 21:47
  • I don't even know its meaning (yeterday; and last week together in the same sentence are confusing me) – Ahmed Sheashaa Nov 8 '14 at 21:52
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    Without context the sentence is basically nonsense as written. The portion after the semicolon stands on its own, but the "Yesterday;" just makes no sense. Were the instructions any more involved than "Find the mistake:"? – Jason Patterson Nov 8 '14 at 21:56
  • Moreover, there is no modal verb in this quotation. – StoneyB on hiatus Nov 8 '14 at 21:57
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    The exercise is poorly constructed, I think. "Find the mistake" is more like "Guess what this sentence is trying to say!" – 200_success Nov 9 '14 at 11:01

If you were constructing the sentence today, yet referring to yesterday's knowledge, the structure might be

Yesterday; I thought he travelled next week.

Though that in itself implies new knowledge was acquired today, adding a

... however, today I discovered differently; he will travel tomorrow.

I cannot think of an instance where 'yesterday' can logically be followed by 'think' [please feel free to correct me] unless it was "Yesterday, at least I think it was yesterday, if not the day before.." etc

I'd need more context on the original quote, I think.... (or I think I thought I think...)

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