Starting with "having"

[Egyption Arrow]

In the name of the Merciful Allah,
Hi, I can't understand beginning a paragraph with a verb+ing . Please, from a grammatical standpoint explain to me starting speech with "having" in this quote: Now, having completed our tour of the nervous system, we return our attention briefly to its internal communication, the endocrine system.
Thanks ahead.

[bhaisahab]

In the name of the Merciful Allah,
Hi, I can't understand beginning a paragraph with a verb+ing . Please, from a grammatical standpoint explain to me starting speech with "having" in this quote: Now, having completed our tour of the nervous system, we return our attention briefly to its internal communication, the endocrine system.
Thanks ahead.

"Now, having completed..." means "Now that we have completed...", it is a perfectly correct way to use 'having'.

[engee30]

In the name of the Merciful Allah,
Hi, I can't understand beginning a paragraph with a verb+ing . Please, from a grammatical standpoint explain to me starting speech with "having" in this quote: Now, having completed our tour of the nervous system, we return our attention briefly to its internal communication, the endocrine system.
Thanks ahead.

Having completed the tour... [non-finite clause] could be short for Since we have completed the tour... [finite clause].

[Egyption Arrow]

Could this be applied to " having" in this quote: This chapter sketches the outline of the field of abnormal psychology and the varied training and activities of the people who work in it. First, however, we cover the ways in which abnormal behavior is defined and classified so that researchers and mental health professionals can communicate with each other about the people they see. Some of the issues here are probably more complex and controversial than you might expect. Having defined " abnormality", we then provide some basic information about the extent of behavioral abnormalities in the population at large.?

[engee30]

Could this be applied to " having" in this quote: This chapter sketches the outline of the field of abnormal psychology and the varied training and activities of the people who work in it. First, however, we cover the ways in which abnormal behavior is defined and classified so that researchers and mental health professionals can communicate with each other about the people they see. Some of the issues here are probably more complex and controversial than you might expect. Having defined " abnormality", we then provide some basic information about the extent of behavioral abnormalities in the population at large.?

In this case, Having defined 'abnormality'...[non-finite clause] could be short for Once we have defined 'abnormality'...[finite clause].