1 Write sentences using have / hasand the past participle of the main verb.1/must/turn off the computer lastnightI must have turned off the computer lastnight.1 He hasn't gone to the hospital yet.they / can't / operate / on him2 Helen is crying.she / could / have / an argument withTed3 Mum isn't here.she / might / go / shopping4 He looks happy.he must pass the test5. She was on her own, she can't get together with herfriendslive​

1 Write sentences using have / has and the past participle of the main verb.

I / must / turn off / the computer last night

I must have turned off the computer last night.

1 He hasn't gone to the hospital yet. They can't have operated on him.

2 Helen is crying. She could have had an argument with Ted.

3 Mum isn't here. She might have gone shopping.

4 He looks happy. He must have passed the test.

5 She was on her own. She can't have got together with her friends.

Думаю что так!

Yesterday I heard my alarm clock but I went back to sleep. I got up late and ran to the kitchen. I burnt my tongue because the milk was too hot! I also cut my finger on a knife and my butter and jam toast fell on the carpet, on the wrong side of course! Afterwards I hit my foot against the door. Ouch, it hurt! When I opened the door of its cage, my canary flew away. Ten minutes later, I caught him in a net and put him back into the cage. Of course, I left home late and missed the bus. I took my bike and rode to school. It was so cold that my fingers froze. There I had a horrible history test. I was so nervous that I broke my pen and forgot everything I knew. In the afternoon, the PE teacher taught us how to fight. I fought against a big boy who beat me so hard that I lost a tooth. And even worse! Somebody stole my MP3 player in my locker. I couldn't believe it! Fortunately, my alarm clock rang again and I realised it was only a bad dream, a real nightmare! What a relief!

1) Science deals with a variety of subjects.
2) Scientists search for the answers to the different questions.
3) The structure of the cells is examined by the scientific fields are not clear (что-то не так написано).
6) The natural, social and technical sciences are closely interconnected.
7) Through the ages, people have invented tools, machines, and materials to make work easier.
8) Science has contributed much to modern technology.
9) Some modern technologies depend on science.
10) During our leisure time we watch TV. 2.a)
wide - great
to research – to study, to investigate, to examine
to attempt – to try
to believe – to consider
to examine - to study
main – major
complex – complicated
difficult - hard
to start – to begin
big -great
a motor – a machine
various - numerous
to study - to examine b)
narrow – wide
easy – complicated
practice – theory
artificial - natural
old - new
more - less
to begin – to end
small - major
little - great