In sentence 1, it is shortly after the end of the week, and what is being built is still not finished, or is just about to be completed (it was expected that what is being built would be finished at the end of the week). In sentence 2, it is some time before the end of the week, and what is being built is still being worked on - and it is expected that at the end of the week, what is being built will be complete.
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AnonymousIn sentence 1, it is shortly after the end of the week, and what is being built is still not finished, or is just about to be completed (it was expected that what is being built would be finished at the end of the week).That is one possible meaning. Another is that it is said before the end of the week. The speaker is saying that there is a reasonabl