You can use 'will', but that is an assertion of certainty, not of futurity.
So It is likely that the shop will be closed at this hour is wrong, should be in this hour for futurity? I am confused......
Me too.
Maybo—I think part of the confusion lies in the fact that you changed the time reference for no apparent reason. In post #1 you said at this moment and then in post #3 you said at this hour. Do you mean now? If so, use is, and not will be. You do not need to say will be if you begin the sentence with the phrase It is likely because the phrase It is likely is enough to express your certainty.
And if you do mean now, then you should say at this time or at this hour, but not at this moment.
Also, do not say in this hour, which is not correct.
Also, if you do mean now, then why are you asking about 'futurity'? If you want to mean a time in the future, then you must change the time phrase. Look:
It's likely that the shop is closed at this time. [now]
The shop will be closed at this time. [now]
It's likely that the shop will be closed later. [future]
The shop will be closed later. [future]
Because I am thinking if it is 4:00pm, and the shop usually is closed between 4:00 to 5:00pm, and I don't know the exact time so I say at this hour.
Can you please explain why in the sentence below, 'will' is used?
"Here are some of the words which were covered in Lessons 712. The following exercise will test how well you learned them."
Because you read that sentence before you do the exercise. So, when you're reading the sentence, the exercise is in the future.
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