Поставьте в пропуски слова в правильном времени: 1)before (to return) from swimming in the river near the camp, steal) our clothes, and we had to walk back with our towels around us. 2)many football fans claimed that after "real (to lose) that important game (to have) no chance to win the championship. 3)we were late. the (to start) by the time we get) to the cinema. 4)at first i thought (to do) the right thing, but i soon realized that make) a serious mistake. 5)after (to eat) they (to clear) the table.

The Present Perfect time denotes an action that has been completed to date or completed in the present time period. Although English verbs in Present Perfect are usually translated into Russian in the past tense, it should be remembered that in English these actions are perceived in the present tense, since they are tied to the present by the result of this action.

Present Perfect tense is formed with the help of the auxiliary verb to have in the present tense and the past participle of the significant verb, that is, its "third form".

To have in the present tense has two forms:

has - 3rd person, unit. h. (He has played)

have - 1 and 2 persons singular and all forms of plural. h. (I have played)

Note:

Personal pronouns and auxiliary verbs are often shortened to he’s, they’ve, etc.

Depending on the time used in the sentence, abbreviations like he’s can be deciphered both as he is and as he has.

The second participle, or the past participle (Participle II), can be obtained by adding the ending -ed to the initial form of a significant verb:

examine – examined

enjoy – enjoyed

close – closed

Объяснение:

So why did a change in climate 36,000 years ago drive the Siberian unicorn extinct, but not the woolly rhinoceros or the saiga?

To answer this question, our study took fossil bones from the Siberian unicorn, woolly rhino, and saiga, and looked at the nitrogen and carbon they contained — as differences in these elements reflect an animal's diet.

We found that before 36,000 years ago the saiga and the Siberian unicorn behaved very similarly, eating grass almost exclusively. After this point, the carbon and nitrogen in saiga bones showed a major dietary shift towards other plant types.

But shifting from a grass diet proved too difficult for the Siberian unicorn, with its special folded wear-resistant teeth and a low-slung head right at grass height.

Relatives such as the woolly rhino had always eaten a more balanced array of plants, and were much less impacted by a change in habitat.

Importantly, the change in climate that drove the Siberian unicorn extinct was actually much less pronounced than those which occurred during the Ice Age that followed. Or the changes that we will face in the near future.

The story of the Siberian unicorn is a timely reminder that even subtle changes in plant distributions can have devastating knock-on effects for large animal species.

Legends of the unicorn, or a beast with a single horn, have been around for millennia.

Some have argued that the horn of the rhino may have been the basis of myths about unicorns, although other animals - such as the tusked narwhal - are more likely contenders.

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