A. Enough comes after adjectives/adverbs and before nouns.
- He is old enough to see that movie. (NOT enough old)
- We have enough books on this topic. (NOT books enough)

B. Words ending in -thing, -body, -one, -where come before their adjectival modifiers.
- I have something nice. (NOT nice something)
- 1 have gone somewhere new. (NOT new somewhere)

C. Subject-verb inversion
Questions involve inversion between subject and verb, but indirect questions involve no such inversion.
- I asked him how long he had been in America. (NOT how long had he been)

When the sentence begins with a negative word, the subject comes after an auxiliary verb.
- Rarely does he work at night. (NOT Rarely he works)
- Not until yesterday did he change his mind.