I have the following construction,
... a shortage of studies that cover the full life cycle.
I doubt if I should say
... a shortage of studies covering the full life cycle.
....another anchor which shares the same ancestor
...another anchor sharing the same ancestor
Which is the best option? In fact, I don't know when to use -ing in relative clause.
Can I always use the reduced relative clause with -ing in present or present continues cases? or it is just for present continues? Or for special cases of present?