GRADE 9 English ENVIRONMENTAL CONSERVATION – GRAMMAR IN USE:MODAL AUXILIARIES Notes
GRAMMAR IN USE: MODAL AUXILIARIES
Subject: English — Topic: Environmental Conservation (for 14-year-olds, Kenya)
Modal auxiliaries (modals) are small verbs that sit before the main verb to show ability, permission, requests, advice, obligation, possibility, or certainty. We use them to talk about actions connected to environmental conservation in Kenya — for example, recycling, tree planting, saving water, protecting wildlife.
- can / could
- may / might
- must
- should / ought to
- will / would
- have to (semi-modal)
Modals do not change form for different persons: "I must", "She must". Use the base form of the main verb after a modal: "must recycle", "should plant".
Uses with examples (Environmental Conservation)
Ability — can / could
I can collect waste from the school compound. (present ability)
Permission / polite request — may / can / could / would
May I plant trees in the school garden? Could you help clean the riverbank?
Advice — should / ought to
You should save water when washing dishes to help conserve water in dry seasons.
Obligation / necessity — must / have to
We must follow NEMA rules when disposing industrial waste. Farmers have to avoid burning forests.
Prohibition — must not / cannot
You must not throw plastic bags into rivers. This harms fish in the Tana River.
Possibility / uncertainty — may / might / could
It might rain tomorrow, so we could delay the tree-planting activity.
Prediction / willingness — will / would
If we plant trees now, they will provide shade and soil protection in future.
Form: Affirmative, Negative, Questions, Short answers
Affirmative: Subject + modal + base verb
Example: "We should recycle plastic bottles."
Negative: Subject + modal + not + base verb
Example: "You must not burn charcoal in protected areas."
Question: Modal + subject + base verb?
Example: "Can we join the school tree-planting day?"
Short answers:
Q: "Should we conserve water?" — A: "Yes, we should." / "No, we shouldn't."
Past meanings and forms
Could is past ability: "When I was younger I could help plant many trees."
Modal + have + past participle shows past possibility or judgment:
- "They might have dumped waste into the river." (possible past action)
- "He must have helped clear the school field." (logical conclusion about the past)
Note: There is no past form of "must". Use "had to" for past obligation: "Last year we had to stop using illegal fishing nets."
Passive with modals
Modal + be + past participle forms passive structures:
"Plastic waste should be recycled." / "Tree seedlings must be watered daily."
Useful phrases (Kenyan context)
- "Schools can organize clean-up days along the Nairobi River."
- "Communities should report illegal logging to the county environment office or NEMA."
- "We must protect wildlife in national parks like Amboseli and Tsavo."
- "Farmers may switch to agroforestry to conserve soil and earn income."
Common mistakes to avoid
- Do not add "to" after modal: wrong — "must to plant"; correct — "must plant".
- Do not change the modal for different subjects: wrong — "She musts"; correct — "She must".
- For past obligations, use "had to" (not "musted"): "We had to stop" (correct).
Practice (use modals)
- Fill in with can / could / may / might / should / must / must not / have to / will:
- We ____ plant trees next Saturday.
- You ____ not throw plastics into the river.
- Farmers ____ use sustainable methods to save soil.
- He ____ help us — he promised.
- It ____ rain later; take an umbrella for the seedlings.
- Change to question form:
- "You should water the seedlings." → "____?"
- "They must stop illegal logging." → "____?"
- Rewrite using modal perfect (for past):
- "Maybe they dumped waste." → "They ____ dumped waste."
- "I am sure he helped." → "He ____ have helped."
Answers (click to view)
1. a) will (or can, if permission/ability) b) must not c) should / have to d) will (or can) e) might
2. a) "Should we water the seedlings?" b) "Must they stop illegal logging?"
3. a) "They might have dumped waste." b) "He must have helped."
Mini visual aid
Final tip: Practice making sentences about things you do in your village, school or county using modals. This helps you speak and write clearly about ways to protect Kenya’s environment.