not be able to =be unable to? 这个词组的否定形式是什么
not be able to =be unable to? 这个词组的否定形式是什么
be able to 否定形式是什么?
be able to 的同义词组是什么?
be not able to do sth be unable to do sth区别
问下be not able to/be unable to/can't 有什么区别
be unable to do与be not able to do有什么区别
be able to的be是什么词
be not able to be unble to do 的区别是什么?请举列回答.
be able to的同义词是什么?
be able to 是什么时态
be able to的现在完成时形式为_________able to?
seem to be的否定形式是seem not to be还是don't seem to be