Usage of Verb-ing V/s Verbal

[kapilnitt]

Hi all,

I've got a doubt in one question while solving from OG. I'm not asking question as it is from OG, so i guess it should not be restricted. The question was based on the concept taught by RON in Video (SC related).

According to RON:

We use Verb+ing => 1. When it is personalized or there is someone specific mentioned to do the job. 2. The stress is given on the process/steps of the work and person/doer is not important.

Otherwise, when the verb is not personalized, we go for Verbals i.e. Noun form of the verb (Destroy(v), Destruction (verbal))

Considering the fact above i thought the first one is preferable than the later one:

1. A firm claims the ability of assessing Something (assessment is by firm, who is specific)
2. A firm claims to be able to assess Something.

It is possible that my line of thinking is wrong, as there could be idiom issue, but i feel the solution can come thru my way also.

Please guide.

[jlucero]

Kapil,

You're right that this is simply an idiomatic issue:

I have the ability to fly. (correct)
I am able to fly. (correct)
I have the ability of flight. (wrong)

"Ability of" is incorrect unless the "of" refers to a group and you use "to" later in the sentence:

The ability (of some birds) to migrate thousands of miles is quite astounding.