一、用所给词的适当形式填空。
1. To keep the air clean, we should
2. We shouldn't
3. Look! The man
1. To keep the air clean, we should
plant
(plant) more trees.2. We shouldn't
drive
(drive) so much, because cars use a lot of energy.3. Look! The man
is smoking
. He shouldn't smoke
in public places. (smoke)答案：1. plant 2. drive
3. is smoking, smoke
3. is smoking, smoke
1.
2. You
3.
Should
I take care of my
little brother when you go out?2. You
shouldn't finish
your homework first.3.
What
should I do
before the meal?答案：1. Should，my
2. shouldn't finish
3. What，do
1. 有情态动词的句子变成一般疑问句,把情态动词提前，注意人称的对应变化，故填Should，my。
2. 有情态动词的句子变成否定句,在情态动词后面加 not,故填 shouldn't finish。
3. 询问应该做什么用“What should ... do ... ?”，注意句首字母要大写,故填 What，do。
2. shouldn't finish
3. What，do
1. 有情态动词的句子变成一般疑问句,把情态动词提前，注意人称的对应变化，故填Should，my。
2. 有情态动词的句子变成否定句,在情态动词后面加 not,故填 shouldn't finish。
3. 询问应该做什么用“What should ... do ... ?”，注意句首字母要大写,故填 What，do。