1

A sound can be made by tapping on the hull of a ship.

It will be reflected from you the sea bottom.

We can measure the time interval between the taps and the receipt of the echoes. The depth of the sea at that point can be calculated.

The above sentences can be combined to make one complex statement:

A sound can be made by tapping on the hull of a ship It will be reflected from the sea bottom, and by We can measure measuring the time interval between the taps and the receipt of the echoes, The depth of the sea at that point can be calculated.

2

Every solid object will reflect a sound.

This varies according to the size and nature of the object.

We can make one complex statement as follows:

Every solid object will reflect a sound, varying This varies according to the size and nature of the object.

3

With experience, and with improved apparatus, it is now possible to locate a shoal.

It is possible to tell if it is herring, cold, or other well-known fish, by the pattern of its echo.

We can make one complex statement as follows:

With experience, and with improved apparatus, it is now possible not only to locate a shoal.It is possible but to tell if it is herring, cold, or other well-known fish, by the pattern of its echo.

4

A few years ago it was found that certain bats emit squeaks.

They received echoes. They could locate obstacles.

They could steer clear of obstacles. They could locate flying insects on which they feed.

We can make one complex statement as follows:

A few years ago it was found It has been found that certain bats emit squeaks. , and by receiving They received the echoes. They they could locate and steer clear of obstacles- or They could locate flying insects on which they feed.