Help me check my English translation. Chinese to English.

however, the situation is different in college. (different)

When you go to college, it's different.

english is a compulsory course in college.

College English is compulsory.

There were only four periods(Credit hours) each week,and our classes were very large.

There are only four hours per week, and classes are large.

it was necessary to use a computer if iwant(ed) to keep up with the teaching (schedule).

To keep up with the teaching, I had to use a computer.

i also needed to practice plenty of english listening exercises after class.

I also have a lot of listening practice outside of class.

I had to work (ED DELETED!) ) very hard to learn english well.

I had to work very hard to learn English well.

In parentheses are my changes.

I think the second sentence of course should be changed to major.

The third sentence should be followed by and the number of the students was very large

The penultimate sentence practice is changed to had, plenty of enough means more, it is better to change to lots of or a greatest number of

The last sentence is had to word

The team is at your service.

let me check it out.

Extended content: example sentences].

no problem. maybe something is wrong with the fuse. let me check it out.

right, the fuse is blown out. i can get it fixed right away.

No problem. Maybe something is wrong with the fuse. Let me check it out. That's right, Zhao Shirt's Bao Zhi is broken. I can fix it right away.

let me see if i understand this correctly . am i missing anything?

Let me check if I understand this correctly and if I missed anything?

let me check your heart and lungs . would you undo the buttons and take a deep breath through your mouth.

Let me check your heart and lungs. Please unbutton and breathe openly.