Dear Chairman,
I’m a student from Class1, Grade3. I want to join their club. At school, I study very hardly, and I’m always ready to help others. I got on well with my classmates but I like to help them with their lessons. I often help the old to crossing the road. On the bus, I often offer any possible help to any others. On weekends, I usually go to the park pick up rubbish. I want to join the club very much. For one reason,, I like to make friend and work with others. For other, I will have more chances to help others. I would be glad if accepting..
Dear Chairman,
I’m a student from Class1, Grade3. I want to join their club. At school, I
your（写信用的是第二人称）
study very hardly, and I’m always ready to help others. I got on well with
hard(hard是副词，hardly是几乎不） get（全文一般现在时）
my classmates but I like to help them with their lessons. I often help the old
and（并列）
to crossing the road. On the bus, I often offer any possible help to an\y others.
cross(help sb to do sth)
On weekends, I usually go to the park∧ pick up rubbish. I want to join the
to(目的）
club very much. For one reason,, I like to make friend and work with others.
friends(可数名词）
For other, I will have more chances to help others. I would be glad if
another（固定结构，for one reason, for another)
accepting..
accepted(虚拟语气）
略
1.their 改为your,因为这里说的是我加入你们的俱乐部。
2.hardly改为hard,因为hard既是形容词，又是副词。而hardly“几乎的”。
3.got改get，因为全文用的都是过去式。
4.but改为and,因为这里表示的是并列关系，而不是转折关系。
5.crossing改为cross，因为help sb to do 而不是doing。
6.去掉any，因为offer sth to sb为主动给别人提供帮助，给别人提供给帮助用others就可以，不必用any来修饰。
7.在park后面加上to，因为我们去公园的目的是为了捡垃圾，to do表示的是目的。
8.make friends 是固定搭配，翻译为交朋友。
9.固定结构，for one reason, for another；译为一方面；另一方面。
10.If引导的虚拟条件句，对将来的虚拟，if引导的从句用过去式/were to do/should do，后面的主句用would/should/might do sth.这里表达的是“I would be glad if (I was) accepted.由于前后主语一致，将主句的主语和系动词全都省略了。