1. It's necesssary for you to attend the course.

2. You should turn down the volume at night.

3. So far I've written ten pages of the letter.

4. You must not turn on that machine.

5. Since we got up late,  we missed the first period.

6. They failed the exam because they are so lazy

7. If you don’t do exercise , you will have fat in your blood.

8. I suggest that you should stop here

$\text{⇒ Answer:}$

$\text{1. You need to attend the course.}$

$\text{→ It's necesssary for you to attend the course.}$

$\text{2. You should reduce the volume at night.}$

$\text{→ You should turn down the volume at night.}$

$\text{3. I am on the tenth page of the letter I am writing.}$

$\text{→ So far I have written ten pages of the letter.}$

$\text{4. You are not allowed to turn on that machine.}$

$\text{→ You must not turn on that machine.}$

$\text{5. We got up late, so we missed the first period.}$

$\text{→ Since we got up late, we missed the first period.}$

$\text{6. They are so lazy that they failed the exam.}$

$\text{→ They failed the exam because they are so lazy.}$

$\text{7. You should do exercise or you will have fat in your blood.}$

$\text{→ If you don’t do exercise , you will have fat in your blood.}$

$\text{8. It would be better if you stop here.}$

$\text{→ I suggest that you should stop here.}$

                                    $\text{-----Done by Lhghbebong-----}$

$\text{Cho anh xin câu trả lời hay nhất, 5 sao và cảm ơn nha.}$