“Be able to,” “can” in reduced relative pronouns

I am trying to remember whether the sentences below are correct:

  1. I don’t know this guy being able to complete this task.
  2. I don’t know this guy can complete this task.

I think the first one is correct. (I know they don’t mean much but I am asking in grammatical manner.)

I am also trying to remember how to reduce the “who” within the following sentences:

  1. I don’t know this guy who has been doing this all along.
  2. I don’t know this guy who has done this all along.

Answer

Neither of the first two is correct. It should be

I don’t know if (or whether) this guy can complete this task.

“this guy can complete this task” needs a subordinating conjunction to be added onto the sentence “I don’t know” as a dependent (or subordinate) clause.

Attribution
Source : Link , Question Author : Tarik , Answer Author : mmyers

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