مدونة التربية و التعليم في الجزائر – دروس، فروض، نتائج امتحانات مدونة التربية والتعليم في الجزائر | تحضير الدروس، فروض واختبارات، نتائج البكالوريا وBEM، مسابقات التوظيف، والتوجيه المدرسي للطلاب وأولياء الأمور.
Expressing Ability with Can, Could and Be able to
Introduction
In English, we use different structures to talk about ability — what we are capable of doing. The three main ways are: can, could, and be able to.
1. Can — Present Ability
Can is a modal verb used to express ability in the present. It is followed by the base form of the verb (without “to”).
| Form | Example |
|---|---|
| Affirmative | I can swim very well. |
| Negative | He cannot (can’t) speak Spanish. |
| Question | Can you play the piano? |
2. Could — Past Ability
Could is the past form of “can”. It expresses general ability in the past.
| Form | Example |
|---|---|
| Affirmative | When I was young, I could run fast. |
| Negative | She could not (couldn’t) read at age 4. |
| Question | Could you ride a bike when you were 6? |
3. Be able to — All Tenses
Be able to can be used in any tense. It is more formal than “can” and “could”.
| Tense | Form | Example |
|---|---|---|
| Present | am/is/are able to | She is able to solve this problem. |
| Past | was/were able to | They were able to finish on time. |
| Future | will be able to | I will be able to drive next year. |
| Present perfect | have/has been able to | He has been able to improve his grades. |
Key Difference: Could vs Was/Were able to
Could = general ability in the past (“I could swim when I was 5”).
Was/Were able to = specific achievement in the past (“He was able to escape the fire”).
Examples in Context
- Present: My brother can speak three languages. / He is able to communicate with tourists.
- Past (general): I could climb trees when I was a child.
- Past (specific): The doctor was able to save the patient’s life.
- Future: I will be able to travel alone next summer.
Exercises
Exercise 1: Fill in the blanks with can, could, or be able to (correct form):
1. When I was younger, I _____ run 10 km without stopping.
2. She _____ finish the project last week after working hard.
3. _____ you help me carry this bag, please?
4. I _____ speak English fluently in the future, I hope!
Exercise 2: Rewrite the sentences using “be able to”:
1. I can play football. → I _____ play football.
2. She couldn’t come yesterday. → She _____ come yesterday.
Summary
Use can for present ability, could for past general ability, and be able to for any tense or specific past achievements. Remember: “can” and “could” are modal verbs (no “to”), while “be able to” conjugates like a normal verb.
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