Isn't it good to see …

Nach math fhaicinn …

We saw examples of ro–thilleadh (prolepsis) and ais–thilleadh (analepsis) in Cuspair 9 .

This is when a verbal noun links to a clause which came before it, or after it.

This causes lenition in a situation where there wouldn't be lenition if the clause were not there.

This rule relates only to verbs which take an object (transitive verbs), and so this rule would apply to fàg , which does take an object, but not to falbh which often uses a preposition:

Seo an t–àite a tha mi ag iarraidh fhàgail.
This is the place I want to leave.
Seo an t–àite às a bheil mi ag iarraidh falbh.
This is the place from which I want to go away.

This preposition is often seen and heard at the end as well.

This is fine in some dialects and wrong in others:

Seo an t–àite a tha mi ag iarraidh falbh às.
This is the place I want to get away from.