shalt

second-person singular simple present indicative of shall

(auxiliary, defective, modal, no-past-participle, no-present-participle) Used before a verb to indicate the simple future tense in the first person singular or plural.
(auxiliary, defective, modal, no-past-participle, no-present-participle) Used similarly to indicate determination or obligation in the second and third persons singular or plural.
(auxiliary, defective, modal, no-past-participle, no-present-participle) Used in questions with the first person singular or plural to suggest a possible future action.
(auxiliary, defective, modal, no-past-participle, no-present-participle, obsolete) To owe.