Question

III. Put the verbs in brackets into the correct form. Choose between the Past indefinite and the Present perfect forms: 1. In the past many firms (operate) on a cash basis. 2. Our firm already (extend) its resources through the use of credit. 3. The automobile agency has not (construct) its buildings yet. 4. The company (pay) mortgage recently. 5. The firm (triple) the revenue last year. 6. The use of credit (increase) our income last month. 7. We (produce, not) services for sale since 1980. 8. At last our company (decide) to reduce cash outgo today.

Answer 1

1. In the past many firms operated on a cash basis.
2. Our firm has already extended its resources through the use of credit.
3. The automobile agency has not constructed  its buildings yet. 
4. The company has paid mortgage recently.
5. The firm tripled  the revenue last year.
6. The use of credit increased our income last month.
7. We have not produced  services for sale since 1980.
8. At last our company decided to reduce cash outgo today. 

Answer 2

1. In the past, many firms operated on a cash basis.2. Our firm has already extended its resources through the use of credit.3. The automobile agency has not constructed its buildings yet.4. The company paid the mortgage recently.5. The firm tripled the revenue last year. [[1]](https://fsc.bsu.by/wp-content/uploads/2015/12/Prakticheskaya-grammatika-1-kurs-English-Grammar-Practice-uchebno-metodicheskoe-posobie.pdf) 6. The use of credit increased our income last month.7. We have been producing services for sale since 1980.8. At last, our company has decided to reduce cash outgo today.

Explanation:

- For sentence 1, the verb "operate" should be in the past indefinite form because it refers to a past action that is completed. - For sentence 2, the verb "extend" should be in the present perfect form because it indicates an action that started in the past and has a connection to the present. - For sentence 3, the verb "construct" should be in the present perfect form because it indicates an action that started in the past and has a connection to the present. - For sentence 4, the verb "pay" should be in the past indefinite form because it refers to a past action that is completed. - For sentence 5, the verb "triple" should be in the past indefinite form because it refers to a past action that is completed. - For sentence 6, the verb "increase" should be in the past indefinite form because it refers to a past action that is completed. - For sentence 7, the verb "produce" should be in the present perfect form because it indicates an action that started in the past and has a connection to the present. - For sentence 8, the verb "decide" should be in the present perfect form because it indicates an action that started in the past and has a connection to the present.