X. Use the Present Indefinite or the Future Indefinite Tense: 1. When you (to cross) the street look...

1. Use the Present Indefinite tense: When you cross the street, look left and then right.
2. Use the Future Indefinite tense: It will take you ten minutes if you take a taxi.
3. Use the Present Indefinite tense: If you turn the corner, you see a five-storey building in front of you.
4. Use the Present Indefinite tense: You will catch the train if you hurry.
5. Use the Future Indefinite tense: Let’s wait till the green light is on.
6. Use the Future Indefinite tense: When you get off the bus, I will be there.
7. Use the Future Indefinite tense: Show this card to the policeman if you get lost.
8. Use the Future Indefinite tense: We will walk if there is no bus.
9. Use the Present Indefinite tense: Before you leave for Sochi, ring me up.
10. Use the Present Indefinite tense: If you come at five o’clock, we will see an interesting programme on TV.
11. Use the Future Indefinite tense: As soon as you get my letter, send me some money.
12. Use the Present Indefinite tense: When I get the money, I will buy a new car.
13. Use the Present Indefinite tense: If you are busy on Sunday afternoon, I will invite your friend.
14. Use the Future Indefinite tense: If you look through today’s paper, you will see your picture there.

1. When you cross the street look left and then right.
2. It will take you ten minutes if you take a taxi.
3. If you turn the corner you will see a five-storey building in front of you.
4. You will catch the train if you hurry.
5. Let’s wait till the green light is on.
6. When you get off the bus I will be there.
7. Show this card to the policeman if you get lost.
8. We will walk if there is no bus.
9. Before you leave for Sochi ring me up.
10. If you come at five o’clock we will see an interesting programme on TV.
11. As soon as you get my letter, send me some money.
12. When I get the money I will buy a new car.
13. If you are busy on Sunday afternoon I will invite your friend.
14. If you look through today’s paper you will see your picture there.

To address this exercise, it's important to understand when to use the Present Indefinite (also known as the Present Simple) and the Future Indefinite (also known as the Future Simple) tense in English.

The Present Simple tense is generally used for actions that are habitual or general truths. It is also used in subordinate clauses of time and condition after conjunctions like "when," "if," "before," "as soon as," and "until" when referring to future actions.

The Future Simple tense (formed with "will" + base verb) is used to describe actions that will happen in the future.

Let's apply these rules to the sentences given:

1. When you cross the street, look left and then right.

   • Use Present Simple ("cross") because it's a conditional clause referring to a future action.

2. It will take you ten minutes if you take a taxi.

   • Use Future Simple ("will take") for the main action and Present Simple ("take") in the conditional clause.

3. If you turn the corner, you will see a five-storey building in front of you.

   • Use Present Simple ("turn") in the conditional clause and Future Simple ("will see") for the main action.

4. You will catch the train if you hurry.

   • Use Future Simple ("will catch") for the main action and Present Simple ("hurry") in the conditional clause.

5. Let’s wait till the green light is on.

   • Use Present Simple ("is") because it is a subordinate clause of time.

6. When you get off the bus, I will be there.

   • Use Present Simple ("get off") in the time clause and Future Simple ("will be") for the main action.

7. Show this card to the policeman if you get lost.

   • Use Present Simple ("get") in the conditional clause.

8. We will walk if there is no bus.

   • Use Future Simple ("will walk") for the main action and Present Simple ("is") in the conditional clause.

9. Before you leave for Sochi, ring me up.

   • Use Present Simple ("leave") in the time clause.

10. If you come at five o’clock, we will see an interesting programme on TV.

    • Use Present Simple ("come") in the conditional clause and Future Simple ("will see") for the main action.

11. As soon as you get my letter, send me some money.

    • Use Present Simple ("get") in the time clause.

12. When I get the money, I will buy a new car.

    • Use Present Simple ("get") in the time clause and Future Simple ("will buy") for the main action.

13. If you are busy on Sunday afternoon, I will invite your friend.

    • Use Present Simple ("are") in the conditional clause and Future Simple ("will invite") for the main action.

14. If you look through today’s paper, you will see your picture there.

    • Use Present Simple ("look through") in the conditional clause and Future Simple ("will see") for the main action.

By understanding these rules, you can correctly determine which tense to use in each part of a sentence.