Use the required form of the infinitive after can (could) in the following sentences. 1. Her face was quite unlined and she could not (to be) more than thirty.
2. I’m wondering if something can (to do) about it.
3. Her friend said quickly: “I know where you can (to get) your bicycle fixed.”
4. “You couldn’t (to worry) too much,“ Jack was tempted to say, “if you are still out at one thirty in the morning.”
5. It’s impossible. He can’t (to do) it.
6. There wasn’t anything wrong with tea. There couldn’t (to be).
7. Harry’s story disappointed him because if the girl had been with him at half past eight she couldn’t (to be) at Hexley at the same time.
8. She lay, raised up rather high upon the pillow, her eyes closed and her hair undone. She couldn’t (to sleep), though it would have been hard to say quite how this was evident.
9. “Have you seen anything of Roberta lately?” “Not for ages. I don’t know what she can (to do).
10. He couldn’t (to hear) the news at dinner because his sister hadn’t arrived yet.
11. I can easily (to walk) to the railway station.
12. For several seconds Bolt stared at her, terrified. “I can’t (to die). I don’t want to die.

1. Her face was quite unlined and she couldn't be more than thirty.
In this sentence, we use "couldn't be" because it expresses the impossibility of her being older than thirty based on the description of her face.

2. I'm wondering if something can be done about it.
In this sentence, we use "can be done" to talk about the possibility of taking action to solve the issue.

3. Her friend said quickly: "I know where you can get your bicycle fixed."
In this sentence, we use "can get" to talk about the friend's knowledge of a place where the bicycle can be fixed.

4. "You couldn't worry too much," Jack was tempted to say, "if you are still out at one thirty in the morning."
In this sentence, we use "couldn't worry" to express that worrying too much is not reasonable or necessary given the situation.

5. It's impossible. He can't do it.
In this sentence, we use "can't do" to indicate that it is impossible for him to complete the task.

6. There wasn't anything wrong with tea. There couldn't be.
In this sentence, we use "couldn't be" to express the belief that there was nothing wrong with the tea based on the speaker's perception.

7. Harry's story disappointed him because if the girl had been with him at half-past eight, she couldn't be at Hexley at the same time.
In this sentence, we use "couldn't be" to indicate that it is not possible for the girl to be in two places at the same time.

8. She lay, raised up rather high upon the pillow, her eyes closed and her hair undone. She couldn't sleep, though it would have been hard to say quite how this was evident.
In this sentence, we use "couldn't sleep" to describe her inability to fall asleep, although it is not clearly evident how this is known.

9. "Have you seen anything of Roberta lately?" "Not for ages. I don't know what she can do."
In this sentence, we use "can do" to express the speaker's lack of knowledge or information about what actions Roberta is capable of.

10. He couldn't hear the news at dinner because his sister hadn't arrived yet.
In this sentence, we use "couldn't hear" to explain the reason why he was unable to hear the news, which is his sister's absence.

11. I can easily walk to the railway station.
In this sentence, we use "can easily walk" to describe the speaker's ability to walk to the railway station without difficulty.

12. For several seconds, Bolt stared at her, terrified. "I can't die. I don't want to die."
In this sentence, we use "can't die" to express Bolt's strong desire or unwillingness to die in the given situation.