1, which has different meanings from the present one.

That's because; Since since; because

2. Different pronunciations

In: English [in t]? Beauty [? n t]

Now: English [nau t]? Beauty [na? t]

3. The usage is different. The logical relationship between them is different. Here is an example.

That's because ...

This book is different from that one because it is about chemistry and that book is about history.

This book is different from that one because this one is about chemistry and that one is about history.

Since, since

Now that you have finished your work, you should have a good rest.

Now that you have finished your work, you should have a good rest. That's an English word, pronounced in English [t] and American [t]. It is widely used in English and can be used as adjectives, pronouns, conjunctions, adverbs and fixed collocations.

Extended data:

In that is a fixed collocation, meaning "because", which is synonymous with for the reason, because it can be used to guide the adverbial clause of reason. For example:

1. I'm in a bit of an awkward position because he won't arrive until 10.

I'm in an awkward position because he won't come until 10.

Most of them are not engineers in fact, because most of the work they do is paperwork.

Most of them are not engineers, because they mainly do office work.

I am an optimist, because I believe that human beings don't always stubbornly try to make their lives worse.

I am an optimist, because I don't think that human beings always try to fight against nature and make their lives worse.