Lesson B1 · Intermediate Grammar

Who Helped Whom at the Open Day? Rebuild the Event Record

Rebuild a fictional open-day record with subject and object questions. Read the evidence, ask who did what, and practise two short conversations.

8 min read 1,366 words Updated Oct 20, 2026
Six adults share a map, move a display and pass cups while preparing a community open day.
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An open-day record has lost some names. Read the account, identify each missing role, and ask questions to rebuild the record. This B1 lesson takes about 35 minutes. There are 12 short checks and two conversation tasks. All six volunteers and their actions are fictional.

Meet the event team

The adult volunteers are Nina, Omar, Sara, Ben, Inez and Leo. Nina arranges invitations; Omar helps with the welcome area; Sara prepares the displays; Ben welcomes visitors; Inez shows newcomers around; Leo checks the entrance. These roles introduce the team, but use the account below as evidence for individual actions.

Read the incomplete record

The incomplete record: A. ___ invited Omar. B. Omar helped ___. C. ___ thanked Ben. D. Ben welcomed ___. E. ___ guided Leo. F. Leo called ___. G. ___ gave Sara a map. H. Omar brought ___ a tray of cups. Four gaps name people performing actions; four name people receiving them. Every answer is stated in the account.

Four arrows trace Nina inviting Omar, Omar helping Sara, Sara thanking Ben and Ben welcoming Inez.
Read from actor to receiver. The four facts are also selectable in the text above.

Choose the missing role

Your turn 0 of 4 answered

Answer on paper, then open the explanations below. Enable JavaScript to check answers here.

1 Record A: “___ invited Omar.” What is missing?

Choose one answer.

Answer and explanation

The person who sent the invitation

The account says “Nina invited Omar”. Omar is already shown as the receiver; the gap replaces Nina, the subject.

2 Record B: “Omar helped ___.” What is missing?

Choose one answer.

Answer and explanation

The person receiving help

The account says “Omar helped Sara”. Omar is the known subject and Sara is the missing object.

3 Record E: “___ guided Leo.” What is missing?

Choose one answer.

Answer and explanation

The guide

The account says “Inez guided Leo”. The gap names Inez, who did the guiding.

4 Record F: “Leo called ___.” What is missing?

Choose one answer.

Answer and explanation

The person receiving the call

The account says “Leo called Nina”. Leo is the caller, so Nina is the missing receiver.

Ask and match

For questions 5–8, type the question that would fill the specified gap. Use who and keep the known person and action. For 9–12, choose the complete answer supported by the account.

Your turn 0 of 8 answered

Answer on paper, then open the explanations below. Enable JavaScript to check answers here.

5 Ask for the missing subject in A: “___ invited Omar.”
Answer and explanation

Who invited Omar?

Also accepted: Who invited Omar

Who replaces the subject. Keep invited in the past form. Source: “Nina invited Omar”.

6 Ask for the missing object in B: “Omar helped ___.”
Answer and explanation

Who did Omar help?

Also accepted: Who did Omar help; Whom did Omar help?; Whom did Omar help

Omar remains the subject. Use did + help. Source: “Omar helped Sara”.

7 Ask for the missing subject in C: “___ thanked Ben.”
Answer and explanation

Who thanked Ben?

Also accepted: Who thanked Ben

The missing subject gives the thanks; thanked stays past. Source: “Sara thanked Ben”.

8 Ask for the missing object in D: “Ben welcomed ___.”
Answer and explanation

Who did Ben welcome?

Also accepted: Who did Ben welcome; Whom did Ben welcome?; Whom did Ben welcome

Ben remains the subject. Did requires base welcome. Source: “Ben welcomed Inez”.

9 Which complete answer matches “Who guided Leo?”

Choose one answer.

Answer and explanation

Inez guided Leo.

The account explicitly says “Inez guided Leo around the rooms”. Reversing the names changes the event.

10 Which complete answer matches “Who did Leo call?”

Choose one answer.

Answer and explanation

Leo called Nina.

The account says “Leo called Nina to say that the entrance was ready”. Leo stays the caller in the question.

11 Which complete answer matches “Who gave Sara a map?”

Choose one answer.

Answer and explanation

Nina gave Sara a map.

The account states “Nina gave Sara a map of the building”. Who asks for Nina, the person giving it.

12 Which complete answer matches “Who did Omar bring a tray of cups to?”

Choose one answer.

Answer and explanation

Omar brought Leo a tray of cups.

The account explicitly says “Omar brought Leo a tray of cups”. The receiver is Leo; Omar remains the person bringing them.

Interview another volunteer

Your turn · self-review

Use it yourself

Make your own answer before opening the model. Other accurate answers are possible. Use the checklist to review meaning and form.

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  1. Model answer and explanation

    Who guided Leo? Who did Inez guide? Who gave Sara a map? Who did Nina give a map to? Full answers: Inez guided Leo. Nina gave Sara a map. Checklist: keep the direction of each action; use past guided/gave for subject questions and did + guide/give for object questions. “Whom” is acceptable for the object questions.

  2. Model answer and explanation

    A: Who thanked Ben? B: Sara thanked Ben. A: Who did Leo call? B: Leo called Nina. Checklist: four turns; one subject and one object question; each answer agrees with the original account; no invented event is presented as evidence.

Review the pattern

Restore all eight gaps: A Nina; B Sara; C Sara; D Inez; E Inez; F Nina; G Nina; H Leo. Read every completed line as actor → action → receiver. G has an additional object, the map; the question here asks about the giver, not the thing given.

A subject question keeps the ordinary past verb: “Who invited Omar?” An object question keeps the known subject and uses did + base verb: “Who did Omar help?” Both questions can start with who. That first word alone does not tell you which pattern you need. The full answer makes the role clear.

Transfer to your own fictional event

For the first fact, possible questions are “Who invited Max?” and “Who did Ava invite?” Answer both with “Ava invited Max.” If your answer turns into “Max invited Ava”, you have reversed the roles. Correct the meaning before checking the grammar again.

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