Plural of 'Basis' is ________.

Solution: The plural of "basis" is "bases".

Key rule: For many nouns ending in -is, form the plural by replacing -is with -es.

• basis → bases

• crisis → crises

• analysis → analyses

Common incorrect forms and why they are wrong:

• "Bassies" — incorrect spelling and not a recognized plural form.

• "Basises" — incorrect because the correct pattern is to replace -is with -es, not to add -es to the whole word.

• "Basis" — this is the singular form, not plural.

Final answer: bases