I urgently need you to check these sentences. Whad do you think I should do?

1) I graduated with honours in modern languages and I know how important memory is in learning a foreign language.
2) The headmaster of the school I'm teaching at has warned me not to check and correct my students' mistakes. I usually check all their mistakes and give them a typed correction of their mistakes.
3) I then expect them to repeat the corrected sentences.
4) The students complain that they don't want to repeat the sentences to me because the repetition is mechanical and that they don't learn anything from their mistakes.
5) The unmotivated students have joined forces against me and I don't know how to persuade them to learn!

Commas needed in places.

http://grammar.ccc.commnet.edu/grammar/commas.htm

Sure, I can help you check these sentences. Here are my suggestions:

1) I graduated with honors in modern languages, and I understand the importance of memory in learning a foreign language.

2) The headmaster of the school where I teach has advised against checking and correcting my students' mistakes. However, I usually review all of their mistakes and provide them with a typed correction.

3) Afterwards, I expect them to repeat the corrected sentences.

4) The students are complaining that they don't want to repeat the sentences to me because they find the repetition mechanical, and they feel like they're not learning anything from their mistakes.

5) The unmotivated students have united against me, and I'm uncertain about how to persuade them to engage in learning.

To check these sentences, you can use several strategies. One common approach is to proofread each sentence for grammar, spelling, and punctuation errors. Make sure that your sentences are clear, concise, and convey the intended message. You can also check for coherence and logical flow between different ideas in each sentence.

Furthermore, it's important to consider the context and purpose of your writing. For example, if these sentences are part of a persuasive essay or a formal document, you might need to ensure that your language is appropriate and that you have effectively conveyed your ideas.

Remember to revise and edit your sentences as needed until you feel confident about their accuracy and clarity.