ДО глаголы в времени Passe Compose:
в утвердительной форме :aller, отрицательной форме :nager
во форме глаголы в будущем времени Future Proche:
утвердительной форме:regarder
в отрицательной форме:manger во форме:ecrire(p.p.ecrit​

                                                                                      Moscow, Russia

                                                                                        04/10/2019

Dear Andrew,

Thank you for your recent letter. I was very glad to get it.

In your letter, you asked me about foreign languages. I think that foreign languages are important in our life. But there are a lot of difficulties in learning a foreign language. As for me, the most difficult is grammar. If you don't know grammar, people won't understand you properly. To improve my language skills I watch films and read books in English. But I'm absolutely sure that the best way to learn a foreign language is to go to a country where people speak this language.  

That's all for now.  

Write back soon.

Best wishes,  

Roman

1) Organs and organ systems of any living organism are constantly functioning.

2) This group of researchers recently made an interesting scientific discovery.

3) A new medication burns fat fast.

4) Living cells are able to generate movement.

5) You can observe the direction of movement of particles with the help of a new generation of devices.

6) You can measure the strength of muscle contractions with this device.

7) Movement is one of the main properties of life.

8) You must follow the direction of movement of the experimental animal.

9) Scientific research includes a hypothesis, experiment and conclusions.

10) Each muscle cell contains a protein molecule.