1.rain的形容词是rainny还是直接加y
什么时候双写再加y/ing等后缀.
2.she could swim when she was five,______
是couldn't she是can't she.哪一个情态动词在回答时是还原回答?
3.what for、you’re right、that’s all right、all right这几个词分别是什么意思?
4.You must look left and right before you______（cross）the street.
是填cross还是across.我觉得应该填介词,故across,可是答案上写的是cross.请解释原因.