Is there a difference in meaning between using 「である」 and 「の」 before 「はず」?


There is no difference in meaning between the two:

Both 「~~であるはず」 and 「~~はず」 mean "expected to be ~~", "must be ~~", etc.

The difference is basically in the formality. The former is more formal than the latter.

One more "difference" I would like to mention is regarding what words can precede the two expressions.

Nouns can precede both 「~~であるはず」 and 「~~はず」 with no problems. You can say either 「スミスさんであるはず」 or 「スミスさんはず」 to mean "has got to be Mr./Ms. Smith".

The stems of na-adjectives can only precede 「~~であるはず」 as in 「きれいであるはず」. Careful speakers would not say 「きれいはず」 because they would say 「きれいはず」. 

Finally, i-adjectives and verbs cannot directly precede either of the two expressions in question. Those can only directly precede just 「はず」 as in 「かわいいはず ♡」、「来{く}るはず」, etc.

  • おや、こっちにも11時37分に仕返しDVが – Chocolate Jan 29 '17 at 13:15

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