dùng must với cả have to ( phủ định) í ạ. Giups em với ạ
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1. Hoàn thành các câu dưới đây với thể khẳng định hoặc phủ định của “must”, “have to”, “has to”.
1.1. Students………mustn't……...look at their notes while they are taking the exam.
1.2. My mother has a terrible headache so she………… has to…...stop working today.
1.3. There is an accident and the traffic is blocked. We………… have to…...to stay here for a while.
1.4. You………don't have to……...do that, Mary. I'll do it later.
1.5. He…………must…...wait in line like anyone else.
People will have clean environment if we have the ability to stop making it polluted.
\(a,=2\sqrt{2a}+3\sqrt{2a}-4\sqrt{2a}=\sqrt{2a}\\ b,=3\sqrt{5}-3+\sqrt{5}=4\sqrt{5}-3\\ c,=\dfrac{\sqrt{3}-1+\sqrt{3}+1}{\left(\sqrt{3}+1\right)\left(\sqrt{3}-1\right)}=\dfrac{2\sqrt{3}}{2}=\sqrt{3}\\ d,=-7+5-2\cdot\dfrac{2}{3}+\dfrac{1}{3}\cdot3=-2-\dfrac{4}{3}+1=-\dfrac{7}{3}\)
1 don't have to
2 mustn't steal
3 had to go
4 have to wear
5 must hurry
6 have had to wear
7 mustn't write
8 has to work
9 must stay
10 must get
11 have to wear
12 must leave
13 have to
14 mustn't lose
15 didn't have to
sao ko ai nói gì hết