Here are the completed sentences using can/can’t, could/couldn’t, or the appropriate form of be able to based on the grammatical rules of English:
- I can’t talk to you now. I’m too busy.
- Explanation: We use "can’t" for inability in the present.
- When I lived in Rome I could speak Italian quite well.
- Explanation: "Could" is the past simple form used for general abilities in the past.
- I would love to be able to play tennis very well.
- Explanation: "Can" has no infinitive form. After "would love," the infinitive "to be able to" is required.
- If we don’t hurry up, we won’t be able to catch the last train.
- Explanation: This refers to a specific future possibility. While "can't" is sometimes used for the future, "won't be able to" is more grammatically precise for a future result.
- My mother can see much better now with her new glasses.
- Explanation: "Can" is used for present ability or perception.
- To do this job you need to be able to speak at least two languages.
- Explanation: After the verb "need," we require a "to-infinitive." Since "can" lacks this form, "to be able to" must be used.
- I can help you tonight if you want.
- Explanation: "Can" is used to make offers or express future arrangements and possibilities.
- They haven’t been able to find a flat yet. They are still looking.
- Explanation: The word "yet" indicates the present perfect tense. "Can" has no present perfect form, so "haven't been able to" is used.
Please let me know if you would like to review more grammar exercises or need clarification on these specific rules.
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