already/yet “已经”不同
［高手出招］
1 . The train was __________moving when I got to the station.
2 . Have you started writing your composition ________？
3 . He has _______done his exercises.
4 . They've been there twice ________.
［一语击破］
already 主要用在肯定的陈述句中，通常与动词的完成时连用。如：
Our visitors have come already.
already 也可用在疑问句中，常暗示说话人的“惊奇”、“意外”。如：
Have you already had breakfast？
yet 通常与一般现在时或现在完成时连用，多用于疑问句或否定句中。如：
Has she decided yet？
（ Keys： 1. already 2. yet 3. already 4. already ）
leave/forget “忘记”不同
［高手出招］
1 . I've _________his address.
2 . I_________ my umbrella at home yesterday.
［一语击破］
leave 指将某物遗忘在某个地方，其后要接表示地点的词语。如：
The little girl left her English book at home this morning.
forget 表示“忘记某物”时，不接表示地点的词语。如：
He forgot his English book this morning.
（ Keys ： 1. forgotten 2. left ）
find/find out/look for “找到”不同
［高手了招］
1 . I ________ my pen everywhere， but I haven't ______it.
2 . I _________the baby crying in the next room.
3 . Will you please _______where he lives？
4 . You should _________the broom before the teacher came in.
［一语击破］
find 意思是“找到”，“发现”，“发觉”，通常指找到有形的东西，也可能指偶然发现某物或某种情况，强调结果。如：
Where did you find the pen？
find out 意为“找到”、“查明”、“发现”，多指通过探索、观察而发现，通常带有“经过困难曲折”的含义，后接无形或隐藏的东西。常跟宾语从句。如：
How can you find out who took the book？
look for 意思是“寻找”，强调动作。
（ Keys ： 1. looked for， found 2. found 3. find out 4. find ）
every/each “每个”不同
［高手出招］
1 . _______of the boys is going to speak at the meeting this afternoon.
2 . ______child knows it.
3 . Two boys came in. ___________boy was carrying a box.
4 . ______ one of the workers is working hard.
［一语击破］
each 着重于个别的含义。 every 着重于全体的含义。
each 可以用来指两个以上的人或东西，但是 every 总是指三个以上的人或东西，不能指两个。
every 只能用作定语， each 不仅可以作定语，可以作主语、宾语和同位语。如：
Each has his own name.
（ Keys ： 1. Each 2. Each/Every 3. Each 4. Every/Each ）