yīnwèi míngtiān yào zuò bàogào, wǒ jīntiān wǎnshang bùdébù zài jiā jìxù zhǔnbèi.

Because I have to give a report tomorrow, I have no choice but to keep preparing at home tonight.

Breakdown of yīnwèi míngtiān yào zuò bàogào, wǒ jīntiān wǎnshang bùdébù zài jiā jìxù zhǔnbèi.

• 我wǒ: I
• 家jiā: home
• 在zài: at
• 今天jīntiān: today

Questions & Answers about yīnwèi míngtiān yào zuò bàogào, wǒ jīntiān wǎnshang bùdébù zài jiā jìxù zhǔnbèi.

Why does the sentence begin with 因为?

因为 means because, so it introduces the reason:

• 因为明天要做报告 = Because I have to give a report tomorrow

Chinese often puts the reason first and the main result after it, just like:

• Because X, Y

So the sentence structure is:

• 因为
  • reason, + result

That is very natural in Mandarin.

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Should there be a 所以 after the 因为 clause?

It can be there, but it does not have to be.

A very common pattern is:

• 因为……，所以…… = Because..., therefore...

So you could also say:

• 因为明天要做报告，所以我今天晚上不得不在家继续准备。

In everyday Mandarin, people often omit 所以 when the meaning is already clear.
So the original sentence is completely natural.

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What does 要 mean here? Is it want to or going to?