## build soild walls~~

##### This topic has expert replies
Senior | Next Rank: 100 Posts
Posts: 30
Joined: 27 Mar 2013

### build soild walls~~

by little mice » Fri Apr 26, 2013 7:38 am

00:00

A

B

C

D

E

## Global Stats

There are several ways to build solid walls using just
mud or clay, but the most extensively used method
has been the forming of bricks out of mud or clay.
and, after some preliminary air drying or sun drying.
they are laid
in the wall in mud mortar.

(A) the forming of bricks out of mud or clay, and,
after some preliminary air drying or sun drying,
they are laid
(B) forming the mud or clay into bricks, and, after
some preliminary air drying or sun drying, to
lay them
(C) having bricks formed from mud or clay, and,
after some preliminary air drying or sun drying,
they were laid
(D) to form the mud or clay into bricks, and, after
some preliminary air drying or sun drying, to
lay them
(E) that bricks were formed from mud or clay,
which, after some preliminary air drying or sun
drying, were laid

OAï¼š D

my confusion: why form and lay should be parallel with to build? I understand that the first two must be parallel with each other, but why they should be with"to build" ?

Junior | Next Rank: 30 Posts
Posts: 14
Joined: 24 Apr 2013
Location: Global
Thanked: 8 times
Followed by:2 members
GMAT Score:790
by [email protected] » Fri Apr 26, 2013 7:50 am

00:00

A

B

C

D

E

## Global Stats

Excellent question.

Verbs need to be either in agreement, or in a tense progression in the case of telling a story. eg She worked a full shift, and then came home and ate a sandwich.

In this problem, we begin in the present (are) and (to build) is used as an infinitive. We then shift backward to refer to the past (used) which then must be paralleled tense-wise. The crucial part ISN'T paralleling with the infinitive up top, but paralleling with the other verb (are laid), since its part of the same time/process being described.

Finally, (the forming) is a gerund, which is technically a noun. But (has been...) must be followed by a verb. On the other side, the verb that follows (has been...) has to agree with the tense if (are laid). D is the only answer that fulfills all these requirements.

As an exercise, pick through the other incorrect answers and find the inconsistencies. This will build your attentiveness to tense subtleties within SC problems.

Ben
Ben Miller
Senior Instructor
Chief Curriculum Developer
ApexGMAT
[email protected]

Newbie | Next Rank: 10 Posts
Posts: 2
Joined: 05 Feb 2022

### Re: build soild walls~~

by Fdambro294 » Thu Aug 18, 2022 6:14 pm

00:00

A

B

C

D

E

## Global Stats

“Used” is a tensed verb?

Are you sure it isn’t a Past Participle? (I.e., an intended verb)

Not the greatest explanation….

• Page 1 of 1