作者认为，预期违约是指在合同约定的期限届满之前，当事人一方明确表示或以自己的行为表示将不履行合同的义务。

It is pointed out that anticipatory breaking a contract means that before the expiration of a contract, one party clearly expresses not fulfilling the contract.

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租赁期间届满，当事人可以续订租赁合同， 但约定的租赁期限自续订之日起不得超过二十年。（合同法）

At the end of the lease term, the parties may renew the lease, provided that the renewed term may not exceed twenty years commencing on the date of renewal.

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当事人没有约定保证期间的，自主债务履行期限届满之日起，一般保证的保证人可以行使催告权，连带责任保证的债权人可以请求保证人承担保证责任。

It is not the agreement of guarantee period where the parties have agreed that the guarantee period does not expire until the debtor repays the principal debts and its interest.

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