Unit: EnvironmentTopic: How to Preserve Environment

Mathayomsuksa 2

What is the world coming to?

VDO

What did you see in the VDO?

• Flooding in Thailand

vocabulary

• destroy

vocabulary

• climate

vocabulary

• erode

vocabulary

• steam

vocabulary

• lumber

vocabulary

• shelter

vocabulary review

shelter

climate

vocabulary review

destroy

erode

vocabulary review

steam

lumber

Structure“have to”

Use of Have to

• In general, have to expresses impersonal obligation. The subject of have to is obliged or forced to act by a separate, external power (for example, the Law or school rules). Have to is objective. Look at these examples:

Structure“have to”

In France, you do not have to cut the trees.

subject

do/does/did not

have infinitive with to

Form of Affirmative Sentence

In England, most school children have to protectthe forest.

subject have infinitive with to

Form of Negative Sentence

structure review“have + infinitive with to”

“have + doesn’t/don’t + have + infinitive with to”

What should we fill in the blank?

Honey and Deep _____________ (plant) the trees.

Powly and Joseph ___________________ (water) the trees everyday.

Jason _____________________(not, cut) the trees.

have to water

have to plant

doesn't have to cut

Save the Forest (1)

A change is coming in the forest. Scientists are trying to make the logging companies stop clear cutting. We have to protect the fish, wildlife, and water quality. They have value, too. The forest is a beautiful place that people should be able to enjoy.

It changes everything when the all the trees are cut. The trees, animals, and water depend on each other. Many plants and animals disappear. The water level in the ground changes. It can even affect our climate.

Save the Forest (2)

This does not mean some of the trees cannot be cut. It just means all the trees in one place cannot be cut at one time. It means that you plant new trees when the old ones are cut. When trees are cut in this way, the land does not erode. The streams do not fill with dirt and the animals are not destroyed.

The industry is beginning to cut trees this way. They are leaving many dead trees so small animals will have homes. They are leaving many trees alone to give shade and shelter for animals. This also means that the forest's trees are not all the same kind. This seems very import to the survival of the forests.

Save the Forest (3)

Both the loggers and the forest scientists are trying to agree on things. They have to balance the lumber we need with the forest's protection. A good rule seems to be not to cut more than you grow each year.

Activity 1True or False

Direction: Read the statements below and answer True or False.

True or False

1. Scientists are trying to make the logging companies stop clear cutting.

True False

True or False

2. The forest is a beautiful place that people should not be able to enjoy.

True False

True or False

3. The trees, animals, and water depend on each other.

True False

True or False

4. You plant new trees when the old ones are cut.

True False

True or False

5. People are not leaving many trees to give shade and shelter for animals.

True False

True or False

6. The good rule seems to be not to cut more than you grow each year.

True False

Activity 3First Important Priorities

Part 1

• Discuss in the group about the effects of destroy the forest and write it down in the blank.

Part 2

• Discuss in the group about the important priorities effects of destroy the forest then write it down in the order and give the reasons why it is the most/least important.

Activity 4Fantasize

Direction:

Think and discuss in your group about

“If there were not any tree in the world, what would you do?”