The sentence is not correct. "Know-how" (note the hyphen) is a noun. A person has "technical know-how" if he can make gadgets work.
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andybusyCan the word "experience" become "experiences" ?No.
andybusyWhy it is inappropriate to use ":before" and "further" in the sentence?If they have experience with it, they did it before. "Before" is therefore redundant, and it sounds like it very much.
andybusy sorry there is a typing mistake in the above sentence it should be refined as " Does the following sentence is grammatically correct?Actually, it's "Is the following sentence grammatically correct?"
andybusyFor this part, I don't really understand what do you mean by "left to right time sequence of written English takes care of the order of events without it."I assumed that by "further" you meant "proceed to", which was otiose.
andybusyAlso should I say "Why it is inappropriate to use ":before" and "further" in the sentence?" or "