must / should / can't

Article excerpt · target grammar marked

ARIO also did something unusual — it refused to work when a worker forgot safety glasses. Workers must follow the rules. A robot can't ignore a safety warning. Managers should listen when workers feel controlled.

Grammar Reference · must / should / can't

must — strong

Use must for rules and obligations. You must wear a badge to enter the building.

mustn't — not allowed

Use mustn't when something is prohibited. You mustn't use your phone in the factory.

should — advice

Use should for advice or recommendations. Companies should explain their rules clearly.

can't — not possible

Use can't when something is impossible or not permitted. The robot can't continue without a safety check.

01Exercise 1 — Form · Write the Correct Form

must / should / can't

1.You leave the machine running when you go home.

2.New employees read the safety handbook before they start work.

3.The robot see through walls, so it needs a camera.

4.Managers explain safety rules in a clear and simple way.

5.Workers wear protective gloves in the chemicals area.

6.You ignore a warning light — stop the machine immediately.

02Exercise 2 — Build · Re-order the Words

jumble · capital + full stop + conjugate

1.glasses · must · workers · safety · wear

2.the · touch · mustn't · machine · you · running · when · is · it

3.should · managers · workers · listen · to

4.the · can't · without · a · robot · move · signal

5.the · must · report · worker · problem · the

6.rules · ignore · you · shouldn't · safety

7.a · helmet · must · she · wear

8.enter · can't · without · permission · you

03Exercise 3 — About You

in your notebook

Personalise: complete five sentences about yourself using the target grammar.

must / should / can't01classplan.ai