Find the rule. Spot the error.

B. are displayed

Use “is displayed”: The list of applicants is displayed near the entrance to the office. List is the singular head of the subject; applicants is part of the of-phrase.

C. carries cash

Use “carry cash”: She does not usually carry cash when she travels. Does already marks third-person singular, so the main verb after does not stays in its base form.

E. No error

There is no error. “Explain something to someone” is the correct pattern: explained the process to the visitors. Clearly is an appropriate adverb describing explained.

C. on

Change on to at: The workshop will begin at nine o’clock. Use at for a clock time. On is used with days and dates, such as on Monday.

D. to the venue on time

Remove to from part D: Despite the heavy rain, the team reached the venue on time. Reach takes its destination as a direct object in this use. Compare “arrived at the venue”.

E. No error

There is no error. Have + past participle submitted forms the present perfect, and already fits naturally between the auxiliary and the participle.

B. more taller

Use “taller”, not “more taller”: He is taller than his brother by several centimetres. Taller already marks the comparative; adding more creates a double comparative.

B. must attends

Use “must attend”: The new employees must attend the safety session before starting work. A modal such as must is followed by the base form of the main verb, so attends is incorrect here.

B. have received

Change have to has: Each applicant has received a copy of the instructions. Each applicant is singular, even though the group contains several applicants.

C. between you and I

Use between you and me. Between is a preposition, so the pronoun takes its object form me. The complete sentence is: Please keep this information between you and me until Friday.

C. are useful

Use is useful: The information on these pages is useful for new visitors. Information is uncountable and takes a singular verb; pages is inside a prepositional phrase.

E. No error

There is no error. Has been postponed is a correct present-perfect passive form, until Friday gives the new time boundary, and because introduces a reason clause.

B. to receive

Use to receiving: We look forward to receiving your response next week. In look forward to, to is a preposition, so a following verb takes the -ing form.

E. No error

There is no error. Borrow means receive something temporarily with the intention of returning it. May I + base verb is correct, and the while-clause explains the activity.

B. takes fewer time

Use takes less time. Time in this sense is uncountable, so less is appropriate. Fewer is used with countable plural items, such as fewer steps.

C. to repeat the instructions

Use repeat the instructions: The supervisor made the assistant repeat the instructions before starting the task. In the active pattern make someone do something, the verb has no to. The passive pattern differs: was made to repeat.

B. contain

Use contains: Neither of these files contains the latest version of the agreement. In standard formal agreement, neither is singular; the plural files inside the of-phrase does not make the subject plural.

C. guide available

Use guides: This is one of the most useful guides available to new staff. One of selects one member of a group, so the count noun after of is plural.

D. have increased

Use has increased. The number is the singular subject; requests is inside the of-phrase. Since the service was introduced, the number of requests has increased.

A. A number of employees is attending

Use are attending. A number of means several and takes a plural verb here: A number of employees are attending a training session in the main hall this afternoon. Contrast the singular expression the number of employees.

C. where was the meeting room

Use where the meeting room was. An embedded or reported question uses statement order, with the subject before the verb. Direct question: Where was the meeting room? Reported question: asked where the meeting room was.

E. No error

There is no error. Not only checked … but also corrected joins two parallel past-tense actions with the same subject. Both actions have suitable objects.

C. until the coordinator will return

Use until the coordinator returns. In this ordinary time clause referring to the future, use the present simple after until. The main clause already uses will: We will wait here until the coordinator returns from the meeting.

E. No error

There is no error. Despite is followed by the noun phrase the delay, and the past-tense clauses correctly describe completion before another past event. Although would require a clause, but that is not the word used here.