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20. Now you can speak about most elements of the Periodic Table. Characterize any substance you want except for those ones described above.

UNIT II METALS

Grammar: The Perfect Tenses

The use of since

Text: Rare Metals

1. Translate and memorize the following words.

conduct

luster

primary

fall into

hardness

rare

appear

consequence

plentiful

manufacture

bond

several

purify

alloy

refractory

distribute

ore

rare-earth

mine

refine

ductile

2. Define the parts of speech and translate:

conduct – conductivity; luster – lustrous; primary – primarily; consequence – consequent – consequently; stable – unstable; purify – purity – impurity – purification – pure.

3. Find the pairs of antonyms:

dull, refractory, unite, hard, appear, plentiful, pure, conductive, lustrous, fall into, soft, non-conductive, ignitable, disappear, rare, impure.

4. Find the pairs of synonyms:

several, due to, plentiful, purify, produce, fundamental, refine, manufacture, some, thanks to, common, primary.

Study and remember the following chart:

Perfect Active

have + P II

Perfect Passive

have + been + P II

Present

He has received a letter.

Он получил письмо.

The letter has been received.

Письмо получено.

Past

He had received a letter by the evening yesterday.

Он получил письмо вчера к вечеру.

The letter had been received by the evening yesterday.

Письмо было получено вчера к вечеру.

Future

He will have received a letter by the evening received by the evening tomorrow.

Он получит письмо завтра к вечеру.

The letter will have been received by the evening tomorrow.

Письмо будет получено завтра к вечеру.

5. Form the Present Perfect forms of the following verbs:

Model: to give – have/has given

to be asked - have/has been asked

to begin, to classify, to hear, to state, to learn, to refine, to discover, to find, to found, to mention.

6. Choose the sentences in the Perfect Tenses and translate them.

1. They have carried out the series of experiments successfully. 2. The plan has to be carried out. 3. The group will have carried out all the experiment by the end of the week. 4. The plan has been carried out. 5. The experiment is being carried out. 6. The synthesis has been carrying out for six hours. 7. The plan had been carried out by the 1st of November. 8. We have to carry out the series of experiments for a month.

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