1)
a.The teachers in the classroom are very experienced.
b. The teachers in the classroom was very experienced.
c. The teachers in the classroom is very experienced.
d. The teachers in the classroom have very experienced.
2)
a. Each girl are required to pass the final exam.
b. Each girl were required to pass the final exam.
c. Each girl is required to pass the final exam.
d. Each girl require to pass the final exam.