Open Library - открытая библиотека учебной информации

Открытая библиотека для школьников и студентов. Лекции, конспекты и учебные материалы по всем научным направлениям.

Категории

Биология Complete the sentences with the verb in the correct form, use Present Simple Tense, First and Second Conditionals.
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Exercises

Смешанный тип

Встречаются также предложения смешанного типа, в которых главное и зависимое предложения относятся к разным типам.

54) If he played football all evening (type 2), he will go to bed early (type 1). (He played football all evening, so he will go to bed early.)

55) If I were you (type 2), I wouldn’t have missed the previous lecture (type 3).

56) If she hadn’t missed the lecture yesterday (type 3), she wouldn’t be busy rewriting it now (type 2).

Вместо if могут использоваться другие выражения, такие какunless( = if not), providing/provided (that), so/as long as, on condition (that), what if, suppose/supposing, otherwise (if not), but for, even if, in case of/ in the event ofи т.д.

· Unless you work hard, you will fail the exam.

· But for you, nobody would have watered my plants and they would have withered and died. (If you hadn’t helped,…..)

· In the event of finding something interesting, report immediately.

· Suppose/Supposing we don’t find anything interesting, what shall we report?

· Providing/Provided (that) we have all necessary materials, we will finish the experiment on time.

CONTACT WITH THE WORLD

If we …..(have) no sense cells, we …..( know) anything outside ourselves. Our sense cells …..(be) truly our contact with the outside world. Because we …..(have) them, we can see, hear, smell, taste. We can also feel pressure, heat, and cold. We can tell whether we are lying down or standing up. We …..(know) whether we are still or moving.

In each of these "sensations", not only our sense cells themselves …..(be) active but also parts of the brain. In fact each different sensation …..(consist) of some activity in a special part of the cerebrum. Each type of sensation …..(be) the result of nerve impulses that started in a special sense cell. If you ….. (shake) hands with a friend, you ….. (may) start impulses from throe different kinds of cells in your hand. The pressure of his hand against yours ….. (start) an impulse from pressure-feeling cells. If his hand …..(be) cold, it ….. (start) an impulse from the cells which respond to cold (if his hand …..(be) hot, a different sort of cells …..(be) stimulated). If he ….. (grip) your hand too hard and …..(hurt) you, an impulse is started in some of the nerve endings in the skin. These nerve impulses …..(travel) through the nerve coils to their special parts of the cerebrum, and you …..(have) these three "sensations" - pressure, cold, and pain. The same kind of thing ….. (happen) when you ….. (hear) a loud noise or a beautiful piece of music, or when you …..(see) a traffic light or a chair or words in a book. This senso-cell-to-nervo — cell-to-cerebrum process is the way we can tell the qualities of the world around us - whether it is light or dark, hot or cold, whether something is sweet or sour.