为了区别plan用单数还是复数,先举些例:
1.The police worked out a plan to catch the thief.
2. The plan has a triple purpose.
3. What do you think of our plan?
4. He had a bias toward the plan.
5.The weather wrecked our plans.
6.Any good plans for the weekend?
7.Do the plans meet your aproval?
8. Do you mind changing our plans?
前4个用单数,后4个用复数.由此可见:用单数还是用复数很大程度上决定于说话人心中对"plan"(计划,方案,打算...)是单数还是复数.如第六句,问的人心目中希望有度周末的多种方案,用的就是
plans,而在前4句中指的就一种计划或方案.
所以我认为本问题的答案应该是可以用单数,也可以用复数,只是周末未到,度假方案可以有多种,所以以用复数为佳,而且多数都用复数.