Как будет слово not be able to в правильной глагольной форме?

Настоящее
I am not able to
You (we, they) aren't able to
He (she, it) isn't able to


I (he, she, it) wasn't able to
You (we, they) weren't able to

будущее
I (we) shan't be able to
He (she, it, they, you) won't be able to