The scope of suretyship covers the principal obligation and its interest, liquidated damages, damages, and the cost of realizing the obligation, unless otherwise agreed by the parties. 保证的范围包括主债权及其利息、违约金、损害赔偿金和实现债权的费用。当事人另有约定的，按照其约定。 The period for suretyship is a period to determine that the surety is subject to suretyship liability, without any suspension, interruption, or extension. 保证期间是确定保证人承担保证责任的期间，不发生中止、中断和延长。 A contract of suretyship is a contract accessory to the principal obligation contract. If the principal obligation contract is void, the contract of suretyship is void, except as otherwise provided by the law. 保证合同是主债权债务合同的从合同。主债权债务合同无效的，保证合同无效，但是法律另有规定的除外。