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4. Do good friends need to say something to show they care?
No.
1. I used to think only the same animals live together.
过去我认为只有相同的动物住在一起。
used to do sth. 意为“过去常常做某事，过去曾做过某事”。例如：
Tom used to live here.汤姆过去住在这。
I used to swim in the river when I was a child.当我孩子时我常在河里游泳。
拓展：be used to do sth被用来做…
used to do sth过去常常做…
Knives are used to cut things.
刀用来切东西。
Pens are used to write with.
笔用来写字。
2. The egret helps the rhino stay healthy by cleaning its skin.
白鹭通过帮助犀牛清洗皮肤来帮助它保持健康。by doing sth 通过做…
Let’s start the lesson by singing a song.
By getting up early, I can have an hour for reading English in the morning.
3. It also makes noise to warn the rhino about coming danger.
它会发出声音来警告犀牛即将到来的危险。
warn sb. (not) to do sth.意为“警告某人（不要）干某事”
The police warned the people not to go out in the late night.
4，touch one`s heart 打动某人
注：另附word文档，点此链接
一.用所给单词的适当形式填空
1.I used to （take）a walk after supper.
2.Water is usd to (drink).
3.Tom made a living by ﹙write﹚
4.He warned me to (stop) talking.
take
drink