（错）We have discussed about the problem .
（对）We have discussed the problem .
（对）We have had a discussion about the problem .
(2) discuss sth with sb 和某人讨论……
We will discuss the changes of our school with them later .
(3) discuss freely 自由讨论，discuss fully / thoroughly 充分讨论，discuss keenly 激烈讨论，under discussion 在讨论中，have a long discussion about / on sth 对……进行长时间的讨论， a heated / hot discussion 热烈的讨论。
Your suggestion is very helpful .
〖点拨〗
(1) 含有suggestion 的主语从句、表语从句、同位语从句、定语从句中主句谓语用 should 型虚拟式。
We agree to his suggestion that the book (should) be published once more .
(2) suggestion 的搭配有：make a helpful / timely suggestion 作出有益（适时）的建议。act on / at one's suggestion = act on / at the suggestion of sb 按照某人的建议做。
(3) suggestion , advice 和 opinion
advice 多指根据自己的学识和经验提出来的供人参考的意见。suggestion 指为改进工作、解决问题而提出的建议，比 advice 委婉。opinion 是日常用语，指对某事的观点、想法。另外，advice 是不可数名词。
Advice is seldom welcome . (谚语) 忠言逆耳。
In our opinion , these trees must be cut down at once .
We have decided to pay more attention to their suggestions .
1. at the doctor's 在诊所
At the doctor's you can have your eyesight tested .
2. visit a doctor = see a doctor 看医生，看病，就诊
He had to visit a doctor because of his heart trouble .
3. a piece of bread 一块面包
4. a bit 有点儿（修饰形容词）
These apples are a bit green . 这些苹果有些生。
5. have a good rest 好好休息一下
6. in four hours' time 四小时后，四小时内
Take two pills now and two more in fours' time .
They will arrive in two hours' time .
7. a diet of 一种……的食物
Every person needs water and a diet of healthy foods .
8 . different kinds of 不同种类的
There are different kinds of moon cakes on Mid-Autumn Day .
Different kinds of book ( = Different kinds of books = Books of different kinds ) are on show in the book fair .
9. in calories 以卡来计算
The energy is measured in calories . 这种能量以卡来计算。
10. be asleep 睡者（强调状态）。fall asleep 睡着（强调动作）
11. burn up 烧掉，烧毁；消耗掉。
While you are walking , your body is burning up 100 calories an hour .
If the satellite returns to the earth too fast , it burns up on the way .
The house burned up before the firemen got there .
12. as much as 像……那样多；多达；到达……的程度。as much as 用于不可数的物体，而 as many as 则用于可数的物体。该结构还可以变化为：as much + 不可数名词 + as 或者 as many + 可数名词 + as 的形式。
Here is a bottle of ink . You may use as much as you need .
The average distance of the sun from the earth is as much as 150 million kilometres .
Unit 15 Healthy Eating教学案例