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?

closed as off-topic by snailboat, Brian Tompsett - 汤莱恩, Glorfindel, Usernew, tchrist Oct 24 '15 at 10:14

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Proofreading questions are off-topic unless a specific source of concern in the text is clearly identified. See: Alternative websites for proofreading" – snailboat, Brian Tompsett - 汤莱恩, Glorfindel, Usernew, tchrist
If this question can be reworded to fit the rules in the help center, please edit the question.

  • 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 Ehab Nov 8 '14 at 21:52
  • 2
    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 Nov 8 '14 at 21:57
  • 1
    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...)

Not the answer you're looking for? Browse other questions tagged or ask your own question.