yuktipoddar wrote:
In a cardboard representation of nucleotide subunits, Watson and Crick,
elaborating on other scientists’ theories which had failed to explain the nucleotide structures and pairings in their entirety,accurately modeled the double-helix DNA.
(A) elaborating on other scientists’ theories which had failed to explain the nucleotide structures and pairings in their entirety,
(B) elaborating on other scientists’ theories failed to explain the nucleotide structures and pairings in their entirety,
(C) elaborating on other scientists’ theories which have failed to explain the nucleotide structures and pairings in their entirety,
(D) elaborated on other scientists’ theories which fail to explain the nucleotide structures and pairings in their entirety,
(E) elaborated on other scientists’ theories which had failed to explain the nucleotide structures and pairings in their entirety,
Please explain which verb-ing form / verb-ed form will be used in the above answer?
Also explain the reasoning behind. Thanks in advance!
Please explain the rules for present participle in case a noun phrase is preceding?
sometimes things like which should have a comma or not, matters only when we dont want to show that the information which we are providing is not an essential one.
said that we didn't need a comma here.
which pronoun is correctly referring back to the theories.
My doubt is pertaining to the past perfect tense which is used here...
(D) elaborated on other scientists’ theories which fail to explain the nucleotide structures and pairings in their entirety,
(E) elaborated on other scientists’ theories which had failed to explain the nucleotide structures and pairings in their entirety,
so there is a timeline,
first the scientists
elaborated on the past theories, after that, they
modeled a new helix.