"That you should wear a hat is necessary."
I saw this sentence in a grammar part of my English book, maybe explaining that a that-clause can be substitute by '"it" and then be moved to the end. I understood this part well but suddenly, I thought that the sentence, "That you should wear a hat is necessary", is seemed to be duplicate. I mean, I think that It is okay to use either "You should wear a hat" or "That you wear a hat is necessary". However, that sentence is using both of them in mixing. So, I wonder if the top sentence is the same thing that I just offer. If not the same thing, I want to know the difference.
Thank you in advance.
"should" can be used in several ways. One of the ways you can use "should" is to convey the idea of obligation or duty. It's the " should of obligation".
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"should" can be used in several ways.
One of the ways you can use "should" is to convey the idea of obligation or duty. It's the "should of obligation". It means something like "it would be a good idea if ...". The first example below therefore means something like "It would be a good idea if you wore a hat" or "It is advisable for you to wear a hat".
You should wear a