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keys
a pair of glasses
book
plastic
metal
paper
glass
1.throw
threw
thrown
up 呕吐；抛起
into 扔进去
away 扔掉
out 扔掉；伸出；说出；否决；突出
eg: He threw up his dinner.
eg: She threw the clothes into the bags.
eg: They need to throw away the garbage.
eg: He threw out a project.
Language points
It is a waste to use paper only on one side.
It is not right to waste things.
It is dangerous to leave broken glass on the ground.
2. It 的用法
形式主语
表语
真正主语
To waste things is not right.
1.They____ (throw) away a lot of garbage yesterday.
2. It's not right ________ (laugh) at people in trouble
3. To help our parents do the housework is right. (改为同义句)