Legal analysis: Whether the guarantor undertakes the responsibility of loan extension depends on the specific situation. If the guarantor agrees, the guarantor will continue to bear the responsibility. Without the consent of the guarantor, after the expiration of the guarantee period, it will not assume the guarantee responsibility.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 695 Where, without the written consent of the guarantor, the creditor and the debtor negotiate to change the contents of the principal creditor's rights and debts contract or reduce the debts, the guarantor shall still be liable for the changed debts; Where the debt is aggravated, the guarantor shall not be liable for the aggravated part.

Without the written consent of the guarantor, if the creditor and the debtor change the performance period of the principal creditor's rights and debts contract, the guarantee period will not be affected.

Article 678 The borrower may apply to the lender for extension before the repayment period expires. If the lender agrees, it can be extended.