帮忙写篇英语作文啊（汉译英）很着急 谢谢谢谢

我先试一下吧
Hello, everyone. I’m the president of the student union. And I’m here to announce that our school is going to hold a lecture at 3 o’clock p.m. Saturday at the school hall. The famous American professor will give us a lesson of how to learn English and the difference between American and British English. All of the student should intend on time. After the lecture, every class shall make a discussion about what you have learnt.

把楼上的改了下，没有拼写和语法错误了，还改了些东西说法，更地道点呵呵
1&2 Our school will hold an English lecture this Tuesday afternoon at 3 o'clock in will be in the auditorium.
3 The lecturer is a famous professor from the United States.
4 The topic is about how to learn English successfully and the differences between American English and British English.
5 It is mandatory for all students to present at the lecture on time. Students will have class discussions after the lecture.

our school will held an english lecture this tuesday afternoo