because vs. as

[Sweetpumpkin]

Hi,

I have some question on the difference between because and as.

As I felt tired, I went to bed early.
As I was feeling tired, I went to bed early.

You can change the sentences above to this:

As feeling tired, I went to bed early.

How about 'because'?

Because I felt(I was feeling) tired, I went to bed early.
-> Because feeling tired, I went to bed early.

I think this time, for because, we should put 'of' next to 'Because'. Because itself doesn't have any prepositional features like as- So it needs 'of' when it takes a noun phrase including pronouns and a active participal construction(i.e., starting with -ing), I think.

What do you think?

Thanks,
sweetpumpkin

[Jamie (K)]

You can only say "because of" before a noun phrase.

These two are somewhat archaic:
As I felt tired, I went to bed early.
As I was feeling tired, I went to bed early.

Normally, we would say:
Because I felt tired, I went to bed early.
Because I was feeling tired, I went to bed early.

Since I felt tired, I went to bed early.
Since I was feeling tired, I went to bed early.

This one is ungrammatical; it can't be used:
As feeling tired, I went to bed early.

This one is okay:
Because I felt (I was feeling) tired, I went to bed early.

Very bad:
-> Because feeling tired, I went to bed early.