When can you use being as though at the start of sentence?

"Being as though" is generally considered non-standard English and is rarely used at the start of a sentence. It's a phrase that mixes up the structures of "being" and "as though," creating a clunky and awkward phrasing.

Here are some examples of how to express the same idea more clearly:

Instead of: "Being as though he was tired, he went to bed early."

Use:

* "Because he was tired, he went to bed early." (This is the most direct and clear option.)

* "As if he was tired, he went to bed early." (This emphasizes the appearance of tiredness.)

* "Since he was tired, he went to bed early." (This emphasizes the reason for going to bed early.)

In rare cases, "being as though" might be used for stylistic effect, but it's best avoided in formal writing or everyday speech.