I don't know exactly how to express these concepts. I urgently need to express them in English. Please, help me!

1) Tomorrow I will tell both our French and German partners that your school is going to cooperate with us on the project.
2) We have agreed on a common theme concerning both a chemical, microbiological analyses of water (river for us and the atlantic ocean for the French school) in each school's local area.
3) Ten students and two teachers will take part in this two-year project. Each school decides which students to include in the project. High achievers of next year's third classes of high school and will mainly concentrate on a comparative study of biodiversity in each of the schools’ local areas.
5) In particular, your school will have to carry out an analyses of water in its local area but will also help the Italian science teachers to build a scientific vocabulary in English to be used when working on the project.
6) It would be nice if you coul follow us tomorrow morning in a video conference through Skype.
7) Here is the school's phone number if you want to get in touch with us tomorrow

1) Tomorrow I will tell both our French and German partners that your school is going to join in on this project.

2) We have agreed on a common theme including both chemical and microbiological analyses of water in each school's local area: river water for us and the Atlantic Ocean for the French school.

3) Ten students and two teachers will take part in this two-year project. Each school will decide which students to include in the project. Students selected will be high achievers in next year's third classes of high school and will mainly concentrate on a comparative study of biodiversity in each school's local area.

5) In particular, your school would analyze the water in your local area, and you would also help the Italian science teachers build a scientific vocabulary in English, to be used when working on the project.

6) Please follow us tomorrow morning in a video conference by means of Skype.

7) Here is the school's phone number if you want to get in touch with us tomorrow.

Here is how you can express each concept in English:

1) Tomorrow, I will inform both our French and German partners that your school is going to collaborate with us on the project.

To express this concept in English, you can use the future tense ("will") to indicate that the action will take place in the future. You can also use the word "inform" to convey the act of telling or informing someone about something.

2) We have reached an agreement regarding a common theme for conducting chemical and microbiological analyses of water in our respective local areas: a river for our school and the Atlantic Ocean for the French school.

In this sentence, it is important to use the word "regarding" to indicate what the agreement is about. Additionally, you can specify the details of the analyses and mention the location of each school's local area.

3) Ten students and two teachers will participate in this two-year project. Each school will decide which students to include. The selected students will be high achievers from the upcoming third-grade classes in high school and will primarily focus on conducting a comparative study of biodiversity in their respective local areas.

In this explanation, you can use the word "participate" to indicate involvement in the project. Additionally, it is important to clarify that the decision regarding which students to include will be made by each school separately. Mentioning that the selected students will be high achievers from the next year's third-grade classes in high school, as well as specifying the main focus of the study, will provide more details about the project.

5) Specifically, your school will be responsible for conducting water analyses in its local area. Additionally, your school will assist Italian science teachers in developing a scientific vocabulary in English, which will be used during the project.

Here, it is important to use the word "specifically" to indicate a more detailed explanation. Mentioning the involvement of the Italian science teachers and their need for help in building a scientific vocabulary in English provides additional context and clarifies the shared responsibilities within the project.

6) It would be appreciated if you could join us tomorrow morning for a video conference through Skype.

In this sentence, using the phrase "it would be appreciated" expresses politeness and gratitude. Additionally, specifying the desired time and mode of communication (video conference through Skype) provides clear instructions.

7) Here is the school's phone number if you would like to contact us tomorrow.

To provide the school's phone number, simply state the phrase "Here is" followed by the phone number. Indicate that the contact should be made tomorrow for better clarity.