What does as time goes by mean?

I wonder what the difference between the two phrases given in the title is. For example:

As time goes by, people have learned that the earth is not the center of the universe.

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As time has gone by, people no longer think the earth is the center of the universe.

As time goes by, people have no longer thought that the earth is the center of the universe.

As time has gone by, people think the earth is not the center of the universe.

Here is my confusion:

Are both phrases correct? (present simple vs. present perfect)

What"s the correct combination for "As time goes by"/"As time has gone by", the existence of "no longer" (for things that has changed), & whether the following sentence uses a simple tense or a perfect tense?


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edited Jan 23 "18 at 10:52
iBug
asked Jan 23 "18 at 10:01
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When you start a sentence with a clause based on as time goes by, the second clause describes what happens as the time is passing, và so it has khổng lồ be of the same tense as the as time goes by clause. You can"t, for example, use present simple in the first clause và present perfect in the second clause.

We use the simple present to talk about general truths: things that were true in the past, are true now & always will be true.

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As time goes by, we realise that nothing in life is certain, apart from death.

We use present perfect lớn talk about things that have taken place over a period of time & are still happening, or things that happened in the past and have sầu some lasting effect (for example making a reservation).

As time has gone by, people have sầu become more dependent on their phones.

Realising that the earth is not the centre of the universe is something that happened a long time ago: it is no longer an issue. It therefore makes more sense to use past simple. For past simple, we want a verb that expresses an sự kiện rather than a state, so learn works better than think:

As time went by, people learned that the Earth is not the center of the universe.

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Two other comments about your sentences. First, people is plural, so it"s people think, not people thinks. Second, if we want to talk about the planet we live on, we ususally (but not always) use the definite article the earth. The capital letter on Earth is optional.