f4当中合同法一直是大纲中最为重要，也是难点最多的一部分知识点。
那么今天就为同学们总结一下f4当中合同法的习题讲解，这部分内容体系比较复杂重要，所以帮助大家做些题目逐渐了解这章内容。
1.which of the following would not terminate an offer?
a.acceptance
b.a counter-offer
c.revocation by the offeror
d.death of the offeree
答案解析：a
下列哪个选项将不会终止一个offer，其中b,c,d分别是反要约，要约的撤回，以及受要约人的死亡，这三项都会终止要约，只有a，是对要约的承诺，结果是形成有法律约束力的合同，并不是terminate终止要约。
acceptance of an offer has the effect of making the contract binding.the contract is formed on the basis of the clear terms of the offer,which survive as such.
2.which of the following statements about revocation of an offer is true?
a.the postal rule applies to revocation of an offer
b.it can be revoked at any time before acceptance
c.revocation must be communicated personally by the offeror
答案解析：b
题目问的是下列选项中关于要约的撤回哪一项是正确的，这道题目当中容易错的选项是a，所以对于邮递规则一定要清楚是acceptance的送达方式；b是正确选项，要约可以在承诺之前的任意时刻撤回。
an offer can be revoked at any point up until an acceptance has been made.once an offer has been revoked,it is incapable of acceptance.revocation must,however,be effective.it must therefore be actually received by the offeree,but can be communicated by a third party.
3.wesley offered to sell his car to harold for£700.harold said he would pay£600.wesley rejected the£600.later harold telephoned to say“i agree with the original price and i’ll transfer the£700 to your bank account”。
for each of the following statements,identify whether it is true or false.
（1）harold has accepted wesley’s offer
（2）harold has made a counter-offer
a.（1）true（2）false
b.（1）true（2）true
c.（1）false（2）true
d.（1）false（2）false
答案解析：c
这道题目给出了具体的案例情况，案例说wesley向harold提出要约出售汽车，价格是700英镑，harold回复说只愿意付出600英镑，这是一个counter-offer，原来的offer已经被终止。所以harold之后做出的acceptance是没有对象的，是无效的。
here there is no contract.harold's counter-offer has the effect of ending the original offer made by wesley and so it no longer exists.as the original offer no longer exists,there is nothing for harold to accept.
4.in contract law,if acceptance is made by means of a letter sent through the post,when is it effective?
a.when the letter is posted
b.when the letter is read
c.when the letter arrives
答案解析：a
这道题目说在合同法当中，如果承诺是通过邮递信件的方式送达，那么一下哪种是有效的送达。直接考察的就是邮递规则的知识点，正确答案是a。
the postal rule is an exception to the general principle that acceptance needs to be communicated.the acceptance is effective at the point at which the letter enters the postal system,even if it never arrives,as in adams v lindsell（1818）。
5.for each of the following,indicate whether it is an offer or an invitation to treat.
（1）goods displayed in a shop window
（2）goods taken to the cash desk at a self-service shop
答案解析：（1）itt（2）offer
要求判断下列两项分别属于offer还是itt，涉及到offer和itt的判断问题，回忆书上的pharmaceutical society of great britain v boots cash chemists southern 1952，和5.3.3知识点，可分别判断出1是itt，2是offer。
an offer is a promise to be bound on particular terms,which must be capable of acceptance.goods in a window are inviting offers to be made,as are goods displayed on a shelf in a self-service shop.the offer is made by the customer when they take the goods and offer to pay.