tā bǎ dēng kāi le, wǒ jiù kàn shū.

把 marks a “disposal” construction: it brings the object (灯) in front of the verb and highlights that the action changes or affects it. The pattern is typically:

• 把 + object + verb + result/aspect/complement Here, 把灯开了 focuses on the light being turned on (affected/result), not just the action of “turning.”

Both are correct.

• 她开了灯: neutral SVO; simply states she turned on the light.
• 她把灯开了: emphasizes the effect on the light (now on) and the resultfulness of the action. It can sound a bit more “event/result” focused.

Functionally yes. A classic way to show that explicitly is:

• 她一开灯，我就看书。 Avoid putting 把 in the “一…就…” frame; say 一开灯, not “一把灯开…”.

Both work.

• 开灯 / 把灯开了: very common, colloquial for turning lights on.
• 把灯打开(了): also natural; sounds a bit more explicit or careful about the resultant “open/on” state.
• 打开灯 is acceptable, but in speech 开灯 or 把灯打开 is more frequent.

Place 就 after the subject and before the verb phrase:

• 我就看书 This is the standard position for adverbs like 就, 也, 都, 常常, etc.

Use 没(有) and drop the perfective 了:

• 她没开灯 or 她没有把灯打开. If you want to keep the same consequence pattern, you might say:
• 她没开灯，我就不看书。 (If she didn’t turn it on, then I don’t read.)

看书 primarily means “to read (books).” It can imply “study” in context (e.g., spending time reading to learn). Contrast:

• 看书: read (silently) in general.
• 读书: can mean “to read (aloud)” or “to study/attend school” depending on context.

Yes, to describe a continuous state:

• 开着灯，我看书。 (With the light on, I read.)
• Instruction/state-keeping: 把灯开着。 (Keep the light on.) In narratives about a completed turning-on event, use 了; for the ongoing state, use 着.

The 了 in the first clause anchors that action as completed (often read as past). The second clause inherits that timeframe and, with 就, reads like an immediate result. For a future/conditional feel, use:

• 她一开灯，我就看书。
• 她开了灯以后，我就看书。