IBEFOREE

Start of a rule that keeps you from spelling weirdly?

• Rule broken by Heidi?

• Rule broken in leisure?

• Spelling principle

• Start of a rule broken by foreigners?

• Start of a rule with numerous exceptions

• Start of a school rule

• Start of a speller's shibboleth

• Start of a spelling mnemonic

• Start of a spelling rule

• Start of an English rule, and this puzzle's theme