míngtiān wǒ huì zài jiā.

In this sentence, 会 means “will / is likely to,” expressing a prediction or expectation about the future. It does not mean “can/know how” here.

• Ability/learned skill: 我会游泳 = I can (know how to) swim.
• Future prediction: 明天我会在家 = I will be at home tomorrow (I expect/it’s likely).

You wouldn’t use 能 here for simple prediction. 能 is about ability/permission/possibility due to circumstances (e.g., 我明天能在家吗？ = Am I allowed/able to be at home tomorrow?).

Yes. 明天我在家 is natural. Nuance:

• 明天我在家: a plain statement of arrangement/fact (tomorrow, I’m at home).
• 明天我会在家: adds a predictive or assuring tone (“I will be at home,” likely/expected).

Both are common; context decides which feels better.

Chinese likes time expressions early in the sentence. Acceptable variants:

• 明天我会在家
• 我明天会在家 Both are fine. Don’t put the time at the very end: 我会在家明天 sounds unnatural in neutral speech.

Here 在 functions like “to be located at,” and 在家 is the location phrase. The structure is:

• Time + Subject + (modal) + 在 + Place. So 明天我会在家 fits the common pattern Time–Subject–Modal–Location.

Don’t add 是 before 在 in a neutral statement. 在 already acts as the main predicate (“to be at”). So use 我在家, not 我是在家.

• 我是/是在… can appear only to add contrastive emphasis in context (e.g., A: 你明天在公司还是在家？ B: 我明天是在家。). But as a default form, stick with 我在家 or 我会在家.

Both can work, with nuance:

• 我明天不在家: plain statement of fact (I won’t be at home).
• 我明天不会在家: prediction/emphasis that it won’t be the case. For the past, use 没(有)在家: 昨天我没在家 (I wasn’t at home yesterday).

Common ways:

• 明天你在家吗？
• 明天你会在家吗？ (slight predictive nuance) A-not-A patterns:
• 明天你在不在家？
• 明天你会不会在家？ Short answers:
• 在/不在 or 会/不会 (depending on the question).

Different uses:

• Locative 在: 我在家 = I’m at home (location).
• Progressive 在 + Verb: 我在看书 = I’m reading (ongoing action). In your sentence, 在 is the locative verb/preposition introducing a place.

Add a verb like 待/呆 or an adverbial:

• 我明天会在家待一天。
• 我明天会一直在家。
• 我明天在家待着。 To be more specific: 我明天会在家待到晚上。

Pronounce: míngtiān wǒ huì zài jiā.

• 明天 (míngtiān): 2–1.
• 我 (wǒ): third tone, usually a “half-3” (low dip) in flow.
• 会 (huì): 4th.
• 在 (zài): 4th.
• 家 (jiā): 1st. No special sandhi beyond the usual half-3 for 我 here.

Yes, they change the nuance:

• 明天我就会在家: as soon as tomorrow / it’s straightforward or earlier than expected.
• 明天我才会在家: not until tomorrow (later than expected). Both are natural and common for highlighting timing.