Which of the following is correct?

a) We were supposed to go to the game today, but it rained.
b)We were suppose to go to the game today, but it rained.

I think the answer is B

Which verb has the past tense ending on it ... to match "were"??

supposed? The answer is A.

Right

The correct sentence is:

a) We were supposed to go to the game today, but it rained.

To determine the correct answer, we need to understand the difference between "supposed to" and "suppose to."

"Supposed to" is the correct form of the phrase, meaning that something was expected or intended to happen. In this case, it implies that going to the game was the plan or expectation.

On the other hand, "suppose to" is incorrect. The correct form is "supposed to" because "suppose" is a verb that requires an auxiliary verb (typically "to be" or "to have") to express obligation, expectation, or intention.

Therefore, the correct sentence is option a), "We were supposed to go to the game today, but it rained."