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1) I did my Maths homework yesterday. (to do)
2) Does Susan go to England by plane? (to go)
3) They visited a farm two weeks ago. (to visit)
4) Jenny and Peggy don't help their brother. (not/to help)
5) The children weren't at home last weekend. (not/to be)
6) When did you design this wonderful skirt? (to design)
7) My mother doesn't crash into the van. (not/to crash)
8) The boys take off the mudguards of their bicycles. (to take off)
9) Do you visit your aunt ?
1) I..did.......my Maths homework yesterday. (to do)
2).....did....Susan.....go....to England by plane? (to go)
3) They.....visited....a farm two weeks ago. (to visit)
4) Jenny and Peggy....don't help.....their brother. (not/to help)
5) The children...weren't......at home last weekend. (not/to be)
6) When.....do....you.....design....this wonderful skirt? (to design)
7) My mother....doesn't crash.....into the van. (not/to crash)
8) The boys......take off...the mudguards of their bicycles. (to take off)
9).....do....you.....about....your aun

(1) was invented (1) When was nylon invented?
(2) work (2) Who invented nylon?
(3) was introduced (3) When was nylon introduced to the world?
(4) became (4) What was the best present for many women during the Second World War?
(5) was used (5) How long has nylon played an important part in our lives?
(6) is found
(7) has played
(8) will be manufactured
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I was listening to the radio when the door bell was ringing
=> rang
I was listening to the radio when the door bell was ringing
=> rang

- Why did their guests leave for home?
- What do you have to do?
Bạn Nguyễn Thế Bảo làm sai rồi nha bạn, left là quá khứ của chữ leave mà?

1. If my sister has enough time, she will cook me an enormous meal.
2. If I doing the homework, I will tired.
3. If she stayed up late yesterday, she will sleeping now
4. If we won the lottery yesterday we will have a lot of money now.(if)
5. If I didn’t learn English, I won't pass the exam.
6. If she has a lot of money, she will buy this computer
7.If I loved him, I will get married with him.(if)
1. My sister will have enough time. She will cook me an enormous meal.(if)
=>If my sister has enogh time,she'll cook me an enormous meal.
2. Doing the homework makes me tired.(if)
=>If I do the homework,I'll tired
3. She is sleeping now because she stayed up late yesterday.(if)
=>If she stayed up late yesterday,she'll sleeping now.
4. We won the lottery yesterday so we have a lot of money now.(if)
=>If we won the lottery yesterday,we'll have a lot of money now.
5. I didn’t learn English so I didn’t pass the exam.(if)
=>=>If I didn't learn English,I won't pass the exam.
6. She can’t buy this computer because she has no money.(if)
=>If she has a lot of money,she'll buy this computer,
7. I loved him so I got married with him.(if)
=>If I loved him,I'll get married with him
IV. Complete the sentenses with the verbs from the box.
1. Hover cars that can fly in the sky are coming sooner than you think.
2. She stopped rowing and let the boat float with the stream.
3. He piloted the helicopter from Paris to Deauville.
4. Will cars of the future ever drive themselves?
5. We all want to ride on a skateboard that actually hovers above the ground.
6. My brother pedaled to school on his bicycle.
7. Yesterday afternoon, we rented a swan boat and sailed around the lake.
8. Some transport inventions became popular, but others flopped!
9. The plane crashed into Trinity Bay and broke apart.
10. They sold everything and bought a boat to sail around the world.