1. listen, hear, sound的辨析：
(1) listen表示有意识地听，仔细地听，但不一定听到什么，强调听得动作，它可以单独使用以引起对方的注意；listen为不及物动词，后接宾语，要跟to连用；
e.g. Listen to me very carefully.
Listen, Mary is singing.
(2) hear可作及物动词，也可作不及物动词，意为“听见；听到”，既可以只有意识地听到，也可以指无意识地听到，强调听的结果。hear作不及物动词时，常有以下结构：hear of/about表示“听别人说（间接听到）”；hear from表示“收到某人的来信”；
e.g. Did you hear what I said?
I can’t hear you.
Suddenly I heard a strange noise.
I heard of/about the famous star before.
She hasn’t heard from her boyfriend.
(3) sound意为“听起来”，为系动词，后接形容词作表语或与like连用，强调听的效果。
e.g. The idea/It sounds good.
Sound like you have a good time.
2.strict的用法辨析：
(1) be strict with sb. “对某人严格要求”；
(2) be strict in sth. “在某方面严格要求”。
e.g. My mother is strict with me in many ways.
Tom’s Chinese teacher is strict in writing.
3. Why don’t you do sth.? 或Why not do
sth.? 意为“为什么不做某事呢？”，用来询问意见或提出意见，看法。
e. g. Why don’t read a book?
Why not read a book?
4. be made of 与be made from的区别：
(1)都表示“由……制成”，主语为制成品；
(2)be made of 表示制成成品后，仍能看出原材料,只发生了物理变化；
(3)be made of from表示制成的东西完全失去了原材料的外形和特征，发生了化学变化。
e.g. The kite is made of paper.
The paper is made from wood.
Butter is made from milk.
