Yes, you are right. Thank you very much for giving me advice, too!

By the way, I need to include this sentence in an email. Could you please check it?
1)
As promised, I'm sending you both the email address and the password of my first class so that your students can get in touch with mine.
2) About twenty students will take part in the email partnership. I hope you have recovered from your illness and can enjoy your weekend.

Both sentences are fine as they are.

=)

Of course! I'd be happy to help you check your sentence. Here's a breakdown of your two sentences:

1) "As promised, I'm sending you both the email address and the password of my first class so that your students can get in touch with mine."

This sentence appears to be grammatically correct and conveys the intended meaning. It effectively communicates that you are fulfilling a promise by providing the recipient with both the email address and the password of your first class. You also mention the purpose of sharing this information, which is to enable communication between your students and theirs. Overall, it seems well-constructed and clear.

2) "About twenty students will take part in the email partnership. I hope you have recovered from your illness and can enjoy your weekend."

This sentence also appears to be grammatically correct. It states that approximately twenty students will participate in the email partnership, conveying the number of students involved. The second part of the sentence expresses a well-wish for the recipient's recovery from an illness and then wishes them a pleasant weekend. It conveys a polite and friendly tone.

Both sentences seem appropriate for an email and convey the necessary information effectively. Well done!