I urgently need you to check these sentences. Thank you.

1) As our students we'll probably have to learn science in English in their last year of high school, we would rather they used English as the lingua franca for their Comenius project.
2) I think either your school or the French school can act as a coordinator.
3) We are therefore ready to check and sign your application form as soon as we receive it from you (Can you help me express it better).
4) I thought the deadline to hand in the application form was 21 February. Are there different deadlines depending on the legislation of the European country involved?
5) Are we certain that our project will be financed by the EU?

1) Because our students will probably have to study science in English during their last year of high school, we would rather they use English as the lingua franca for their Comenius project.

2) OK

3) As soon as we receive your application, we are ready to review it and sign it.

4) OK

5) OK

1) The sentence structure is a bit confusing. To make it clearer, we can rephrase it as: "Since our students might have to learn science in English in their last year of high school, we would prefer that they use English as the lingua franca for their Comenius project."

2) The sentence is grammatically correct. However, if you want to make it more concise, you can say: "Either your school or the French school can act as the coordinator."

3) The sentence is grammatically correct, but it can be improved for clarity. Here's a better way to express it: "Once we receive your application form, we are prepared to promptly review and sign it."

4) The sentence is correct. However, if you want to clarify the meaning, you can say: "I believed the deadline for submitting the application form was on 21 February. Does the deadline vary depending on the legislation of the European country involved?"

5) The sentence is grammatically correct. To make it more formal, you can say: "Can we be certain that our project will receive funding from the EU?"