Grammar: ⚙️ Verbs in Depth: 🎭 Modals & 🌱 Non-Finite Verbs (Advanced) (B2) - Lesson 4: Passive Voice with Modals (The work must be finished.)

ESL Cambodia 🇰🇭

Passive Modals

Must be done. Can be seen.

[Image of passive voice structure diagram]

Active (Subject Does)

You must finish the work.

➔

Passive (Focus on Object)

The work must be finished.

Modal + BE + Verb 3

(Past Participle)

⚠️ Must (ត្រូវតែ)

The report must be sent today.

របាយការណ៍ត្រូវតែផ្ញើនៅថ្ងៃនេះ

Shoes must be taken off.

ស្បែកជើងត្រូវតែដោះចេញ

✅ Can (អាច)

Tickets can be bought online.

សំបុត្រអាចទិញបានតាមអនឡាញ

Angkor Wat can be visited daily.

អង្គរវត្តអាចចូលទស្សនាបានរាល់ថ្ងៃ

Project Deadline 📅

Boss & Employee

Manager 👩‍💼

Is the project ready?

Staff 🧑‍💻

Not yet. The design must be approved first.

Manager 👩‍💼

Okay. When can it be done?

Staff 🧑‍💻

It should be finished by tomorrow.

⚠️ Common Mistake:

❌ Wrong: "It must be finish." (Verb 1)
✅ Right: "It must be finished." (Verb 3)

Passive Check 🧠

Select the correct form.

The room ___ cleaned every day.

Mobile phones ___ used here. (Prohibition)

This water ___ drunk. (Possibility)

Mission 📝

Classroom Rules

Rewrite as Passive:

Change these rules so they sound formal.

• 1. You must turn off phones.
  ➔ Phones must be turned off.
• 2. You should do homework.
  ➔ Homework ___________________.
• 3. You can answer questions.
  ➔ Questions __________________.