cfaking Wrote:Thanks Ron
Learnt a lot from your explanations
can you pls explain option E also
how to kill option E?
thanks in advance
(e) is subtle.
it's essential to realize that there are two kinds of "it":
(1)
it is ADJ that/to... --> this is the only instance in which "it" is allowed to function WITHOUT a noun as antecedent.
(2) "it" as a normal pronoun.
examples of (1):
(*)
it is obvious that we are going to be late.(**)
it is easy to hit the ball. --> notice that "the ball", NOT "it", is the object of "hit" in this case!
now, note:
(***)
the ball is easy to hit. --> notice that "the ball" is the object of "hit" again.
(****)
it is easy to hit. --> here "it" stands for the ball. this sentence would NOT be ok on its own; it would have to be preceded by some other sentence indicating that "it" = "the ball".
the correct answer here is structured like (**).
the incorrect choice (e) is structured like (****). since "do" can't be used alone (it MUST have an object), the "it" is forced into the role of being that object. the problem, of course, is that "it" is thus a pronoun - which doesn't stand for anything.
in the correct answer,
do so doesn't require an object, so "it" is free to behave as it does in (**) above.