Answered By: Writing Center Last Updated: Apr 20, 2015 Views: 0
Can is used follow the format: subject + can + infinitive. It is used for one's ability to do something. Negative form is cannot(can't). Past tense is could. For example, She can read an entire book in a day. She can't read an entire book in a day. She could read an entire book in a day.
Be able to is used if can cannot be used since can has only two forms: present (can) and past (could). For example: I have been able to travel across the Asian continent.
Was able to or managed to are used for specific actions done in the past. For example, When the accident happened, I was able to find help.
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