Solutions for: App 349 / Must or Have to (1)

Practise using "must" and "have to" correctly!
We use "must" and "have to" to talk about things that are necessary to do. They almost mean the same. We often use "must" for more personal ideas about what is necessary to do. For example: I must send Ben a letter (I really want to write to him). Must is also used in formal writing or notices. For example: Passengers must fasten their seatbelts.

We use "have to" for what somebody else thinks is necessary to do or rules that can not be changed. For example: Mum said I have to send Ben a letter. (Mum wants me to write a letter). OR: You have to wear a school uniform in England.

"Must" is not used in questions, use "have to" instead!
For sentences in the past or future you also always use "have to" (in the correct tense). For example: I had to help Mum with gardening yesterday.
I don't want to, but I __________ look after my little sister this afternoon.

Solution:
have to
When do you __________ be home?

Solution:
have to
I __________ remember to send my aunt a birthday card, it is important to me!

Solution:
must
Why do you always __________ be so late?

Solution:
have to
I __________ thank Hugo for helping me with the homework, that was so nice of him.

Solution:
must
Dad says I __________ write a letter to Uncle Bill, but I really don't like him.

Solution:
have to
Passengers __________ not smoke onboard our planes!

Solution:
must
I really __________ tell Mum about the great news!

Solution:
must
Do you __________ play the piano every day?

Solution:
have to
Ben __________ do the shopping yesterday because Mum and Dad were away.

Solution:
had to
Lucas __________ finish the English essay by tomorrow, Mr Bell said.

Solution:
has to
She __________ take the bus last week because of the heavy snowfall.

Solution:
had to
What do you __________ do after school?

Solution:
have to
I __________ ring Isabel today, I want to tell her something!

Solution:
must