4. It was once thought …
Eggs were thought to make the voice pretty.
Tomatoes were believed to have magical powers
They were called love apples and were supposed to make people who ate them fall in love.
上面的这些句子全部用的是被动语态。
suppose 是一个常用词，请注意掌握。
1) I suppose it was reasonable for him to want his money back.(我看他想要回他的钱是合理的。)
2) I am not supposed to talk to you about this.(我不能和你谈这个。)
3) Suppose / Supposing something should go wrong， what would you do?(如果有了什么差错，你怎么办?)
5. How surprised the people who thought tomatoes poisonous would be if they could know that millions of pounds of tomatoes were supplied to soldiers overseas during WWII.
“how surprised the people would be”是主句，这是一个感叹句;who 引导的定语从句修饰people;if 引导的是条件状语从句。
感叹句通常用what 或how 引起。what 用来修饰一个名词，how 修饰一个形容词，副词或动词。
本句中that 引导的是一个表语从句
7. Washing food down with water as a substitute for chewing is not a good idea.
substitute for 是一个常用词组，意思是“代替，代用品”;substitute也可以做动词用，意思是“替代”。请看例句：
1) Don't you think it a good idea to use plastic as a substitute for wood?
(你觉得用塑料做木材的代用品是个好主意吗?)
2) Daydreaming cannot substitute for hard work.(白日梦不能取代辛勤的努力。)
8. Many people think of bread as a carbohydrate food.
think of … as是一个习惯用法，意思是“把…看作是…”，“认为…是…”。请看下面的句子：
1) People think of him as a hero.(人们把他看作英雄。)
与think of …as 意思相近的习惯用法还有regard …as;consider…as;look upon…as;view…as;see …as 等等。
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