Here are several sentences that a site says is wrong
That site is wrong. These sentences are perfectly fine and used often. Yes, they are not specific date/times, but that doesn't mean they are incorrect.
In the workplace and school settings "next week" usually means "sometime during the next calendar week". So Saturday will come, and then Sunday, and then will be the start of the next calendar week, Monday! And that will end on Friday (usually, unless most people work on Saturday there too).
So common descriptors that would go before the words "next week" would be
- "early next week"
- "later part of next week"
- "middle of next week"
- "sometime next week"
- "by the end of next week"
So when people don't say any more description than "next week", I'd usually take it to mean anytime during next week.
So, I changed it to make it clear sentence like followings.
The next week after this will be sunny and warm.
Give me a call the next week after this one and we'll have lunch.
This is really not making things more clear. It is uselessly redundant. It doesn't make things any more specific than just saying "next week".
(1) seven days starting now
No. Hardly ever would it mean that. If someone wants to say that it will be sunny and warm for the next 7 days, they'll not say "The next week will be sunny and warm." They would say something like, "At least the next 7 days are going to be sunny and warm." Or "The rest of this week and most of next week will be sunny and warm".
So if you want to be exactly clear about what you mean, then just use sentences like this:
- The upcoming calendar week calls for warm and sunny weather.
- Not next week, but the next should finally bring in some good chances for rain.
- A week from today the assignment is due by 3pm!
- Give me a call sometime next week and we'll have lunch.
- She'll be out of town all of next week.
- She'll be out of town till Friday. (or whatever day she'll be back if not gone the whole week)
This means that before July 28th, no more homework will be assigned (or due, depending on context).
Until, From OLD
up to the point in time or the event mentioned
And it we use: day 28, or the 28th day, or July 28th, or 28 July (in AmE).
Best Answer
First, I think you're correct when you say that in would be a better preposition than on for these examples. As one commenter said, on is typically used when referring to a specific day (e.g., on Monday, on the last day of the quarter, on her birthday, on the thirteenth).
That said, I noticed that none of your examples were written by authors of published books, or by journalists writing for newspapers. Instead, they look like announcements, perhaps cobbled together by someone taking notes at a meeting. So it's not too surprising that this minor mistake was made, and it's the kind of thing most native speakers wouldn't notice too much.
When the event is relatively short compared to the week itself, and the specific date is not yet known, you might use during or in, and qualify that with sometime:
If the event lasts multiple days, such that it spans all or most of the week, then we could use during or throughout:
Note that throughout in the second set of examples suggests there are many days of tryouts, not just one. If we used during instead, that could mean many tryout sessions over the course of the week, but there might also be just one day of tryouts sometime that week.