“Явное” подлежащее

1. Личное местоимение (I, he, she, we, they), занимающее любое место в предложении:

With so many molecules in the air it is small wonder that we cannot perceive

them separately as they hurtle into us.

2. Первое личное местоимение it или you:

It will be recalled that decimal system is used throughout the paper.

3. Первое существительное с определителем (т.е. с артиклем или любым его заменителем):

The pressure did not change, nor did the temperature.

A discovery should be dated only from that time…

4. Первое количественное числительное без определителя или первое порядковое числительное с определителем:

25 is the sum of 9 and 16.

If P is any point on a curve, there are two numbers that describe its

position.

The first is the distance…

5. Первое имя собственное или географическое название с заглавной буквы со своим определителем или без него:

Aristotle gave a fairly exact account of the dolphin’s anatomy and

behaviour in the 4th century B. C.

6. Первая формула, буква или сокращение:

Y is a constant for the element which by integration may be shown to be the

period of average life in seconds.

SO₂ decomposes to sulphur and oxygen