Option 1 (using “had”) seems very unlikely to me. The situation it describes is that you currently feel that you previously experienced and previously completed knowing. It’s made even more unlikely by the reference frame “all my life”, which is not a previously completed period for anyone speaking!
Option 2 (using “have”) places the knowing in the continuous mood, meaning it started in the past (near beginning of the speaker’s life in this case) and continues through the present.
Option 2 is appropriate for both scenarios.
In the first case (conveying automatic comfort with someone), “feel as if I have” conveys the irrealis mood to the (untrue) fact of knowing this person your entire life.
In the second case (providing qualitative impression of relationship length), “feel as if I have” is again appropriate, because it is not strictly true that you have known this person your entire life. It feels that way because it is nearly that span of time (and because before you knew them you didn’t know much of anything else anyway), but irrealis is appropriate again (for a slightly different reason).
ran for, ran after, and took all work in this sentence. In fact so does ran into but that is not what is being said here (that one is funny). The difference is their precise meaning. Note that the sentence is incorrect, it should read:
He __ the bus so he could reach the office in time.
1) He ran for the bus so he could reach the office in time.
This is the most reasonable answer and is appropriate for questions of this type. Using for implies there is a purpose to running, so you should follow it with something that justifies the action.
Examples:
He ran for the presidential office.
He ran for his own good.
2) He ran after the bus so he could reach the office in time.
He ran after shows an action taking place, use of after makes it sound like the man is chasing the bus, not merely getting it. This makes me think of the man actually trying to beat the bus to the bus stop.
Examples:
He ran after the ball and into the street.
He ran after the deer.
If there was a dog named Midnight, I would not say "He ran after Midnight." In this sentence, it sounds like midnight is a time. Instead, we would say "He ran for Midnight," just to avoid confusion.
3) He took the bus so he could reach the office in time.
This is plain and simple, and doesn't imply any need to run. The man simply took the bus.
Examples:
He took the plane to get to Shanghai.
He took the bag so that he would have books for class.
Best Answer
There is little difference between a and some when used in a/some guy....
A is the indefinite article, so you are giving an indefinite reference. A guy here means any one guy. You are not saying anything definite about him, such as providing his identity. Thus, you do not expect your listeners to know who he is.
Some before a singular count noun such as guy means that the guy's identity is unknown or unimportant. Or you do not care to identify who the guy is. So a guy and some guy are extremely close in meaning. There are just certain contexts where a native speaker might choose some instead of a, which is used in many more contexts.
One way in which some differs in usage is that some guy can (but does not have to) be used in a flippant or disparaging way. In other words, if you want to refer to an individual in a way that shows that you have a low opinion of him, you can use some. But you would also have to use a flippant or disparaging tone. A neutral tone would carry a neutral stance toward the person, just as the indefinite article a would.