Unit 7 Protect the Earth 第2课时课件（17张PPT）

(共17张PPT)
Unit
7
Protect
the
Earth
六年级
Read
and
answer
Why
is
the
water
useful?
How
should
we
save
energy?
What
can
trees
help
us
to
do?
What
do
we
use
plastic
to
do?
Story
time
How
to
protect
the
Earth?
We
should
save
water.
We
should
save
energy.
We
should
not
cut
too
many
trees.
How
to
protect
the
Earth?
Grammar
time
1.
should
的用法
We
should/shouldn’t
do…
2.
use
的用法
use…to…
情态动词
should
should
在本课中表示
“应该，必须”，
用于表示忠告、建议等。
例如：
You
should
drink
some
hot
tea
with
honey.
你应该喝些热蜂蜜茶。
She
is
tired.
She
should
go
to
bed
early.
她累了，她应该早点睡觉。
情态动词
should
的用法与情态动词can一样，should的否定形式为should
not或shouldn’t；在疑问句中，should放在主语前，should没有人称和数的变化。例如：
You
should
drink
water.
You
should
not(＝shouldn’t)drink
water.
Should
I
drink
water?
Yes,
you
should./No,
you
shouldn’t.
We
use
water
to
wash
clothes.
use...to...
We
use
water
to
wash
fruits.
We
use
woods
to
build
a
house.
We
use
plastic
to
make
bottles.
Fun
time
Collect
some
paper,
plastic
bags
and
plastic
bottles.
1
Fun
time
How
can
we
reuse
these
things?
2
I
can
reuse
paper
to
make
a
box.
I
can
reuse
plastic
bottle
to
make
a
toy.
总结
1.情态动词should的用法与情态动词can一样，should的否定形式为should
not或shouldn’t；在疑问句中，should放在主语前，should没有人称和数的变化。
2.
use…to…表示“用……做……”