1. This text was written by a girl. (T/F) 2. The author would like to go to Egypt. (T/F)
3. She is going to this country with her parents. (T/F)
4. The girl is going to leave Costa Rica in the afternoon. (T/F)
5. Sara is going to stay in Costa Rica for 2 weeks. (T/F)
6. She does not want to visit the pyramids. (T/F)
7. The author thinks that her vacation will be amazing. (T/F)
My Dream Vacation
My name is Sara and I am going to tell you about my dream vacation. I always dream about going to Egypt Maybe it is just in my imagination, but I have everything already planned.
I am going to go with my mother and my sister, Í m going to stay there for two weeks. I think, I will ride a camel or I will try the exotic food.
Also, I'm going to visit the pyramids which have to be amazing. I'm going to carry fresh clothes like shorts, sandals and a big hat because it's really hot three. I am not going to buy many things because people say everything is very expensive I prefer to take a lot of pictures with my new camera and have fun with my mother and sister. I'm sure I'm going to enjoy my vacation a lot.

They didn`t work in a factory in 1978.
Did they work in a factory in 1978?

I didn`t paint my house.
Did you paint your house?

She didn`t go to the cinema last week.
Did she go to the cinema last week?

We didn`t ride bikes yesterday.
Did we ride bikes yesterday?

Простое неопределенное время (Past Simple) образует отрицательную форму при вс глагола did и частицы not (didn`t)+ инфинитив без частицы to(иными словами глагол в 1ой форме)
Вопросительное предложение строится при этого же вс глагола did,который ставится в начале предложения и инфинитива без частицы to. 

1. He lives in a cell. – He must be a prisoner 2. They're shouting at each other. – They must be having a row 3. I don't think he is telling the truth. – He must be lying 4. I can't find my purse anywhere. – I must have lost it somewhere 5. The dress is gorgeous. – It must have cost you a fortune (OR It must cost a fortune) 6. The leaves on the trees are golden. – It must be autumn 7. The two sisters look alike. – They must be twins 8. The little girl is blowing out the candles on the cake. – She must be celebrating her birthday 9.1 phoned you last night but I got no answer. – There must have been no one at home 10. He was shining like a new penny. – He must have had a shower 11. Everybody is congratulating the producer. -- The film must be a huge success 12. The patient is in the maternity ward of the hospital. – She must be giving birth to a child 13. The creature is green and has an antenna on its head. – It must be an alien 14. The audience is shouting for more. – They must be having a good time at the concert of their favourite singer 15. The hotel had no vacancies – It must have been booked in advance