1. The sanitary engineer is concerned with hydrology. - Present Simple Passive
to concern
2. Different systems of water filters are used in present day. - Present Simple Passive
to use
3. Water finds its way to the rivers. - Present Simple Active
to find
4. Ocean water contains salt and other mineral materials. - Present Simple Active
to contain
5. The earliest written records of water purification date to 2 000 B. C. - Present Simple Active
to date
6. The modern recreation center has been erected in the center of Moscow. - Present Perfect Passive
to erect
-Hi Jack! How are you?
-Hi, Alice! I'm fine! And you?
-Fine, thank you. I have one question)
-What about?
-So, i'm going to the cinema tomorrow. I bought 2 tickets for me and my classmate but she became ill and if you can go with me , please go ) i'll be pleasant
-Okay, and what time will the film start?
-At 7 pm.
-Okay, and how long will the film last?
-I think 2 hours
-okay , see you tomorrow