Timeline for When to use the present or the past perfect tense?

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May 11, 2015 at 10:20	comment	added	iamRR		What would you say about the grammar guideline -- ' a past tense in the main clause will be followed by the past tense in the subordinate clause." ? Is this correct and how strictly one has to follow this guide line ?
May 11, 2015 at 9:32	comment	added	surf		@iamRR, correct! but probably when you are still in the station you would say: "I ' [ha] ve noticed ..."
May 11, 2015 at 9:28	vote	accept	iamRR
May 11, 2015 at 9:28	comment	added	iamRR		I remember that today I asked a question about sentence - "I noticed that the clock has stopped." Some one replied -For ex- you are in a train station and want to let the station official know that the clock has stopped. You could say, "I noticed that the clock has stopped." If, on the other hand, you were telling a story about a day (in the past) when the clock stopped in the station, you would say, "I noticed that the clock had stopped." How correct is this explanation ?
May 11, 2015 at 9:27	comment	added	iamRR		But many people on this forum have said that 'has' is only possible if effects of earthquake can still be seen or havoc is still going on.
May 11, 2015 at 9:08	history	edited	surf	CC BY-SA 3.0	added 321 characters in body
May 11, 2015 at 8:57	history	edited	surf	CC BY-SA 3.0	added 45 characters in body
May 11, 2015 at 8:48	history	answered	surf	CC BY-SA 3.0