I urgently need you to help me express the following concepts. Thank you.

1) Thank you for your last email.I really hope our French partner will agree to use English as the lingua franca for our common project.
2) Since the project will last two years, I believe we should include mainly students from class 11 (rather than from class 12), as we initially suggested.
(As school finishes in year 13 they will be able to complete the project. Can you help me express this??).

Thank you for your last email. I really hope our French partner will agree to use English as the lingua franca for our common project. Since the project will last two years, I believe we should include mainly students from class 11 rather than from class 12, as we initially suggested. In this way, students will be able to complete the project before finishing school in year 13.

Sure, I can help you express these concepts. Here are the possible ways to convey these ideas:

1) Thank you for your last email. I sincerely appreciate your input. In order to ensure smooth communication and collaboration for our common project, I strongly suggest that we consider using English as the lingua franca. This will enable all participants, including our French partner, to actively participate and contribute to the project. Can we further discuss this proposal?

2) Considering that the project duration will be two years, it is my firm belief that it would be beneficial to primarily involve students from class 11, rather than class 12 as initially proposed. By including class 11 students, who will still be enrolled in the school until year 13, we can ensure their continuity and dedication towards the project until its completion. Their participation will contribute significantly to the success of the project. Can we discuss this adjustment and its potential benefits?