17、plain/plainly
Plain主要用作形容词，它的副词为plainly。Plain也偶作副词用，主要用于强调，表示“简直；绝对地”。如：
It was plain stupid for her to attempt suicide.她试图自杀，简直愚蠢之极。
Plainly包括了形容词plain的主要含义。如：
The mountains was plainly visible in the distance.群山从远处清晰可见。
The lease plainly states that all damage must be paid for.租约明确规定，一切损坏必须赔偿。
She was plainly dressed and wore no make-up.她衣着朴素，粉黛不施。
To put it plainly, he’s a crook.实话实话吧，他是个骗子。