19. sleep，sleepy与asleep; wake与awake的辨析
(1) sleep和wake为动词，分别意为“睡觉”；“醒来”；
(2) asleep和awake为形容词，分别意为“熟睡的”；“醒着的”；
(3) sleepy为形容词，意为“疲惫的”，相当于tired
e.g. Tom just wanted to sleep all day because he was so sleepy just now.
Don’t wake up your mother, she is asleep now.
Although my grandmother is sleeping in the bedroom, she is awake.
20. remember to do sth.意为“记得去做某事”，事情未作；
remember doing sth.意为“记得做过某事”，事情已做
e.g. English teacher always reminds Tom to remember to finish his homework on time.
My mother remembered telling the story.
21. remind的用法
(1)remind意为“使人想起，提醒”，为及物动词；
(2) remind sb. of sth. 意为“使……想到某人或某物，提醒某人某物”；
(3) remind sb. to do sth.意为“提醒某人去做某事”；
(4) remind sb. + that从句意为“提醒某人……..”。
e.g. He reminds me of his father.
You must remind her of the meeting she has to attend.
Please remind me to do my homework.
My mother reminds me to have class every day.
The sight of the clock reminded me that I was late.
She reminded me that I hadn’t written to my mother.
22. accent, voice, noise, sound的区分
(1)accent意为“重音，口音” ；
(2)voice意为“声音，嗓音”；
(3)noise意为“喧闹声，嘈杂声，响声”；
(4)sound意为“声音。吵闹”。
e.g. She reads English words with Irish accent.
He spoke with evident accent.
His voice shook with fear.
The little girl spoke in a high childish voice.
I can’t stand the loud noise outside the classroom.
I caught the sound of singing yesterday.
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