Modals of necessity (planning ahead): Choose the correction that expresses required readiness before departure time. Original sentence: "The train will leave at 8.30 pm, we have been ready by 7.30pm so that, we can reach the station in time." Select the best improvement for the underlined segment.

Given data

• Requirement: readiness by 7.30 pm for an 8.30 pm train.
• Original uses present perfect "have been" incorrectly.

Concept/Approach
Use a modal of necessity to state a requirement: must be ready by 7.30 pm.

Option analysis
B. "must be" → clearly expresses necessity. ✔A → simple past; wrong time reference.C → mere present state; lacks the force of necessity.D → "should have" suggests a missed requirement in the past; wrong meaning.E → original aspect is incorrect.

Corrected sentence
"The train will leave at 8.30 pm; we must be ready by 7.30 pm so that we can reach the station in time."

Common pitfalls
Avoid using the present perfect (have been) to refer to a future deadline.

Final Answer
must be