Corby is in business as a retail distributor. The following is a list of his transactions for March 2012:
1 Goods purchased from Smith on credit.
2 Corby introduces further capital in cash into the business.
3 Goods sold for cash.
4 Goods purchased for cash.
5 Cash transferred to the bank.
6 Machinery purchased, paid for in cash.

Required:
State which account in Corby's books of account should be debited and which account should be credited for each transaction.