Ability
Can expresses ability, and in general, could is the past form.
- She can diagnosis patients well.
- When she was a child, she could diagnose her teddy bear well.
Other forms of can are expressed by the phrase, "be able to."
- I have been able to understand this prescription.
- She will be able to go to surgery at 8 pm.
- Being able to study oncology has really helped my patients.
- I would love to be able to do that.
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