ABILITY AND INABILITY
القدرة وعدم القدرة
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القدرة وعدم القدرة في الماضي
يستطيع/ لا يستطيع (في الماضي ) could / couldn't + inf
I could/couldn't do my homework yesterday.
was / were + able to + inf. كان قادر على
(Be) not + able to + inf كان غير قادر على
He was able to do his homework.
He wasn't to do his homework.
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القدرة وعدم القدرة في المضارع
can/ can't + inf يستطيع / لا يستطيع
I can/ can't do my homework.
am/is/are + able to + inf. قادر على
(Be) not + able to + inf. غير قادر على
He is able to do his homework.
. He isn't to do his homework.