Dear N:

You wrote:

1-He took the saw to use in the workshop.

2-He took the saw to be used in the workshop.. Isn’t there a difference in the meanings of these sentences? Could one use ‘2’ if ‘he’ was the only one who was going to use the saw?

While the context could change the meaning slightly, #1 means that he took the saw so that the saw would be used in the workshop. #2 means that he took the saw that was meant to be used in the workshop as opposed to another saw.

3-They beat him up to scare him.

4-They beat him up to be scared. Is sentence ‘4’ correct?

It really does not make much sense. Usually people do not beat others up in order to scare themselves.

5-They took the body to bury it in the cemetery. 

This means “They took the body in order to bury the body in the cemetery.”

6-They took the body to bury in the cemetery.

This means “They took the body in order to bury it in the cemetery as opposed to another burial site.”

7-They took the body to be buried in the cemetery.

This means, “They took the body meant for burial in the cemetery as opposed to another body.”

Since 5, 6, and 7 are close in meaning, the context could change the meaning, but by themselves, these are the closest interpretations.