Pair work. Put these questions to your groupmate. Let him/her answer them. 1. What is the ammeter used for? 2. What is the voltmeter used for? 3. What is the ohmmeter used for?

1. Why shouldn't we play with fire?
Fire may cause serious consequences. If you play with matches, you may burn the house or flat. If you play with a lighter, you may leave it, even accidentally, in the sun and it will explode, and the fragments may hurt somebody. Fire is a very dangerous thing, because it can cause burns. Do not play with fire.
2. Why shouldn't we play with food?
You shouldn't play with food  because you may choke. Eating should be treated with respect, because it is the result of the work of many people - those who have grown or produced goods, as well as of your mother, who has prepared lunch or dinner.
The rule is simple: Those who do not properly behavve at the table - that immediately leaves the table and goes to their room to mind their own business.

Present Perfect1) I have never been to Italy.2) Have you done your homework already?3) I haven't phoned my friend yet.4) My friend have just visited me.  Present Simple1)I usually get up at 6 o'clock.2) Do you like coffee with milk?3) I don't want to stay at home all weekends.4) When does the show start? Past Simple1)I was at school till 4 o'clock yesterday.2)Where did you spend your holidays?3)Nick didn't come to school last friday4)Kate didn't called her mother, but sent the message. Present Continuous1)I am writing a letter at the moment2)Is she sending a card now?3)I am not reading a book now.4)Fred is working in his office now.