Plan A refers to the first plan. Plan B refers to the alternative plan after the original plan is stranded. Plan B refers to the alternative plan after the original plan is stranded.

People often mention it when talking about business, which is equivalent to a contingency plan.

The original plan is plan A, and the changed plan is plan B, which is easy to understand. Interestingly, few people say plan A, and many people use the word plan B.

Shall we adopt plan a or plan b?

Shall we choose the first scheme or the second scheme?

Shall we adopt plan a or plan b?

Shall we adopt the first plan or the second plan?

If plan A fails, carry out plan B..

If the first plan fails, the second plan will be implemented.

Let's plan a big night next week.

Let's organize a big party next week.