join / join in / take part in / attend “参加”不同
[ 高手出招 ] 1. My father is going to the parents meeting .
2. They danced and danced until a lot of us .
3. You go first . I'll you soon .
4. I like the first high school I .
[ 一语击破 ] join 意为“加入某一种组织，成为其中一员”， join 后面还可接表示人的名词或代词，表示加入到 某人或某些人 的行列中去。如： We are going for a swim . Will you come and join us ？
join in 表示“参与某种活动”， in 之后可接名词或动词 -ing 形式，表示“参加某人的活动”，可以说 join sb . in （doing ） sth .如：
Will you join us in playing basketball ？
take part in 指参加会议或群众性活动，重在说明句子主语参加该项活动并在其中 发挥作用 .如：
The teacher took part in our discussion yesterday .
注意： join in 后面可以不跟宾语， take part in 后面必须跟宾语。
试比较：
误： Let us take part in . 正： Let us join in .
attend 意为“出席”，“参加”，指参加会议或议式、婚礼、葬礼、典礼、上课、上学、听报告等，强调的是这一 动作的本身 ，而 不强调 参加者在活动中 起作用 .如：
All the children of school-age in our village have attended school .
Keys ： 1. take part in 2. joined in 3. join 4. attended
make sure / be sure “确信”不同
[ 高手出招 ] 1. I have that he is honest .
2. I that he will come .
3. Will you of his return？
[ 一语击破 ] 两者后面均可接 of 或 about 引出的短语。如：
Are you sure of / about your facts ？
make sure 指“务必、务请、确保”将某事弄清楚； be sure 指某人对某事或对某种情况 有把握 ，常译为“确信”。
make sure 后面的 that 从句一般 不用 或 很少用将来时 ； be sure 后面的 that 从句则 可用将来时 .如：
Make sure that you come here before five .
I am sure that he will succeed .
两者后面接动词 不定式 ，均表示“一定要做某事”，但 make sure 通常只用于 祈使句 ，而 be sure 则 不受限制 .如： It's sure to rain .
Make sure / Be sure to come to the party on time .
Keys ： 1 . made sure 2. am sure 3. make sure