英语重点难点精讲：clean，clear，sweep和wipe① clean用作形容词时，意为“干净的，清洁的”，指没有灰尘或刚清扫过。
The room is clean and tidy. 这房间又干净又整洁。
The room is clean and tidy. 这房间又干净又整洁。
They always keep the classroom clean. 他们总是使教室保持清洁。
② clean用作动词时，指用各种方式“打扫”干净。
Mother cleaned the house for New Year's Day. 母亲把房子打扫干净过新年。
Can you clean the coat of these dirt marks？你能把大衣上的这些污迹洗掉吗？③ clear用作形容词时，意为“（天气）晴朗的，（言语）清楚的，（图像）清晰的”。
That was a fine clear day. 那是一个晴朗的日子。
You haven't made yourself clear. 你还没有把话讲清楚。
The photo is not clear enough. 这幅照片不够清晰。
【比较】The water is clean. 这水是干净的。
The water is clear. 这水是清澈的。
④ clear用作动词时，表示“清除，澄清，使清澈；放晴”。
The rubbish must be cleared away. 这堆垃圾必须清除。
They were busy clearing the pavement of snow. 他们正忙着清除人行道上的积雪。
It is clearing gradually. 天在逐渐放晴。
⑤ sweep指用扫帚扫除尘土或脏东西等。
He swept the dirt into a dustpan. 他把垃圾扫进畚箕。
He went into the yard to sweep up dead leaves. 他到院子里扫除枯叶。
⑥ wipe指用手、抹布、纸等擦拭。
She wiped glasses with a dry towel. 她用一条干毛巾擦玻璃杯。
He sat down to wipe the sweat off the face. 他坐下来，擦掉脸上的汗珠。