FLOW CLOCKS FACTS
Who created flow clocks?
Bernard Gitton
Write the formula for Present Simple Passive.
am/is/are + V3
People use water to measure time.
Water is used to measure time.
Complete: “So far, scientists ___ (create) many clocks.”
have created / have been creating
What liquid do flow clocks use?
Water / Liquid
Identify the tense: “are being filled.”
Present Continuous Passive
The tube fills the containers.
The containers are filled by the tube.
Complete: “Lately, the design ___ (improve).”
has been improved / has improved
When did Gitton start creating flow clocks?
Since 1979
Identify the tense: “has been created.”
Present Perfect Passive
Engineers install these clocks in museums.
These clocks are installed in museums.
Make a Present Perfect Passive sentence about clocks.
Example: “Many clocks have been created.”
Where were early water clocks used in ancient times?
In Egypt
Form Past Simple Passive: “use.”
was/were used
Artists design new versions.
New versions are designed by artists.
Complete: “Bernard Gitton ___ (work) on clocks since 1979.”
has been working