What is the difference between the terms “ought to” in the continuation provisos in the Durish Lease?

Alberta, Canada


The following excerpt is from Freyberg v. Fletcher Challenge Oil and Gas Inc., 2005 ABCA 46 (CanLII):

The respondents also seek to distinguish both Strohschein and Wolff v. Consumers’ Gas Co., [1995] O.J. No. 4004 (Ct. Just.) on the basis that both cases involve the interpretation of leases which include the requirement that the lessee “ought to” perform the lease. Clause 18 of the Lease does not contain a similar term. The respondents also state that the clause in Durish is “substantially identical” to that in Wolff and is therefore also distinguishable. I find that such distinctions are untenable. Not only do continuation provisos only contain positive obligations but the use of the words “ought to” is surplus as all parties ought to fulfill a contract.

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