1. I haven't bought a new book since April.
Since is used to indicate the starting point of an action or event. In this case, the starting point is April. So, the correct answer is since.
2. His wife has changed a lot since the last time we met.
Since is used to indicate the starting point of an action or event. In this case, the starting point is the last time we met. So, the correct answer is since.
3. It hasn't snowed here for six months.
For is used to indicate a duration or period of time. In this case, the duration is six months. So, the correct answer is for.
4. You have kept me waiting for half an hour!
For is used to indicate a duration or period of time. In this case, the duration is half an hour. So, the correct answer is for.
5. We have lived here for many years.
For is used to indicate a duration or period of time. In this case, the duration is many years. So, the correct answer is for.
6. It has been several hours since I had dinner.
Since is used to indicate the starting point of an action or event. In this case, the starting point is when I had dinner. So, the correct answer is since.
7. We haven't met since Christmas.
Since is used to indicate the starting point of an action or event. In this case, the starting point is Christmas. So, the correct answer is since.
8. There hasn't been any war in this country for over a century.
For is used to indicate a duration or period of time. In this case, the duration is over a century. So, the correct answer is for.
9. Nothing has been changed here since the Middle Ages.
Since is used to indicate the starting point of an action or event. In this case, the starting point is the Middle Ages. So, the correct answer is since.
10. My daughter hasn't written to me since my birthday.
Since is used to indicate the starting point of an action or event. In this case, the starting point is my birthday. So, the correct answer is since.
11. They have owned this house since 1995.
Since is used to indicate the starting point of an action or event. In this case, the starting point is 1995. So, the correct answer is since.
12. She has borrowed three books a week from the library since March.
Since is used to indicate the starting point of an action or event. In this case, the starting point is March. So, the correct answer is since.
13. We haven't played tennis for many years.
For is used to indicate a duration or period of time. In this case, the duration is many years. So, the correct answer is for.
14. I have saved some money every payday for three months.
For is used to indicate a duration or period of time. In this case, the duration is three months. So, the correct answer is for.
15. You have visited your uncle every weekend since last March.
Since is used to indicate the starting point of an action or event. In this case, the starting point is last March. So, the correct answer is since.
16. I haven't cleaned my shoes for two days.
For is used to indicate a duration or period of time. In this case, the duration is two days. So, the correct answer is for.
17. He hasn't studied English for many years.
For is used to indicate a duration or period of time. In this case, the duration is many years. So, the correct answer is for.
18. It has rained every Monday since the beginning of May.
Since is used to indicate the starting point of an action or event. In this case, the starting point is the beginning of May. So, the correct answer is since.
19. She has played tennis twice a week for six months.
For is used to indicate a duration or period of time. In this case, the duration is six months. So, the correct answer is for.
20. He hasn't borrowed three of my books since last Saturday.
Since is used to indicate the starting point of an action or event. In this case, the starting point is last Saturday. So, the correct answer is since.
a) Open the brackets using verbs in the correct forms:
1 When the sellers quote prices they usually state on what terms they will deliver the goods.
Explanation: The subject "sellers" is followed by the verb "quote," which is used in the present tense. The pronoun "they" refers to the sellers, so the verb "state" should also be in the present tense. The phrase "on what terms" acts as an adverbial phrase and does not affect the verb tense. Finally, "will" is used to indicate future delivery.
2 They also state at what prices the goods will be delivered.
Explanation: The subject "they" refers to the sellers, so the verb "state" should be in the present tense. The phrase "at what prices" acts as an adverbial phrase and does not affect the verb tense. "Will be" is used to indicate future delivery.
3 If the goods are offered on fob terms, the price will cover the cost of the goods and transportation expenses to the port of shipment.
Explanation: The subject "goods" is followed by the verb "are offered," which is used in the present tense passive voice. The phrase "on fob terms" is an adverbial phrase and does not affect the verb tense. "Will cover" is used to indicate future coverage.
4 If the goods are offered on cif terms, the price includes cost, insurance, and freight.
Explanation: The subject "goods" is followed by the verb "are offered," which is used in the present tense passive voice. The phrase "on cif terms" is an adverbial phrase and does not affect the verb tense. "Includes" is used to indicate the present inclusion of cost, insurance, and freight.
5 In case of fob terms, the goods are usually shipped on board ships or planes.
Explanation: The subject "goods" is followed by the verb "are usually shipped," which is used in the present tense passive voice. The phrase "in case of fob terms" is an adverbial phrase and does not affect the verb tense.
6 Terms of delivery can be stated in different ways.
Explanation: The subject "terms of delivery" is followed by the verb "can be stated," which is used in the present tense passive voice. The phrase "in different ways" is an adverbial phrase and does not affect the verb tense.
Overall, these sentences describe how sellers quote prices and state the terms and conditions of the delivery of goods. They also explain the differences in pricing and delivery options such as fob and cif terms.
