CUSTOMS AND TRADITIONS
OF VIET NAM
Should and shouldn’t

a. We _______ pray in the pagoda
b. We __________ break things on the first day of the lunar month
should
shouldn’t
should or shouldn’t ?
1.You respect old people
2.According to tradition, you sweep the floor on the first day of Tet
3. Children take things from adults with both hands
should
shouldn’t
should
4. You wear shorts when going to the pagoda
5. You bring a gift when you visit someone’s house
shouldn’t
should
1.You should respect old people
2.According to tradition, you shouldn’t sweep the floor on the first day of Tet
3. Children should take things from adults with both hands
4. You shouldn’t wear shorts when going to the pagoda
5. You should bring a gift when you visit someone’s house
You can`t turn left here. You have to turn right (because of the traffic system) 
He has to wear a uniform at work
(because of the factory’s rule)
EXAMPLES :


1. You can`t turn right here. You have to turn left (because of the traffic system) 
2. Her office is far from her house, so she has to go to work by car.
“Have to” to express obligation or necessity

(+) S +
+ V (bare infinitive)
/has to
must
Notice : don’t/doesn’t have to :
have to
(-) S+
+ have to
don’t/doesn’t
+ V (bare infinitive)
(?) Do/Does
+ S +
have to
+ V (bare infinitive) ?
không được (dùng để ngăn cấm )
không phải, không cần thiết
not (mustn’t) :
Fill in the blank with “mustn’t” or
“don’t/doesn’t have to”
1. I have already done the homework. You ____________ help me with it.
2. The sign says “No parking”. We __________ park here.
3. I`m not working tomorrow, so I _________ get up early
4. He ________________ tell her the news because she has just known it.
5. They promise they will be on time. They _______ be late.
6. The baby is sleeping. You _______make noise
Fill in the blank with “mustn’t” or
“don’t/doesn’t have to”
1. I have already done the homework. You ____________ help me with it.
2. The sign says “No parking”. We __________ park here.
3. I`m not working tomorrow, so I _________ get up early
4. He ________________ tell her the news because she has just known it.
5. They promise they will be on time. They _______ be late.
6. The baby is sleeping. You _______ make noise
don’t have to
mustn’t
don’t have to
doesn’t have to
mustn’t
mustn’t
Complete the sentences with
the correct form of “have to”
1.My mother says that I _______ be home by 9 p.m
2.We ______ go now because our dad is waiting for us
3. She ______ wear that costume because it’s the family tradition.
4.In the past, men ________ wear Ao dai, but today they __________ wear it.
5. Before leaving the dinner table, ________ your son _________ask for permission?
6. We ___________ go to school today because it was raining heavily.
Complete the sentences with
the correct form of “have to”
1.My mother says that I _______ be home by 9 p.m sharp.
2.We ______ go now because our dad is waiting for us
3. She ________ wear that costume because it’s the family tradition.
4.In the past, men ________ wear Ao dai, but today they ______________ wear it.
5. Before leaving the dinner table, ________ your son _________ask for permission?
6. We __________________ go to school today because it was raining heavily.
have to
has to
have to
had to
don’t have to
have to
Does
didn’t have to
THANKS FOR
YOUR ATTENDING
AND
OBSERVING!