raisyuu ha kaigi ga ooi kara, narubeku hayaku sigoto wo owarasetai.

は marks the topic. 来週は sets “as for next week” as the context, often with a slight contrastive feel (compared to other weeks). You could also say 来週、会議が多い (just using a time adverb), but 来週は makes “next week” the thing you’re talking about.

Relative time words like 来週/今日/明日 usually don’t take に; say 来週会議があります, not ✕来週に会議があります (except in special emphatic or formal scheduling contexts).

With adjectives of quantity/frequency like 多い/少ない, the typical pattern is Nが多い/少ない. So 会議が多い means “(there) are many meetings.”

• 会議は多い is possible when contrasting (e.g., “Meetings are many, but …”).
• 会議を多い is ungrammatical because 多い is an adjective, not a verb that can take を.

Generally no. 多い doesn’t directly modify a noun in the simple “many X” sense. Use one of these:

• 会議が多い
• 会議がたくさんある
• 多くの会議 (more formal/written)

Yes. In conversation, you can say:

• なるべく早く仕事を終わらせたい。来週は会議が多いから。 Ending with から sounds casual/spoken, as if trailing off with “because…”. In formal writing, avoid ending with から; instead use ので, ため, or reorder the clauses.

Both mean “as much/… as possible.”

• なるべく often feels like “if possible/if you can manage,” slightly softer or request-like.
• できるだけ is more literal “to the extent one can,” a bit more neutral. Both fit here: なるべく早く ≈ できるだけ早く. There’s also casual なるだけ (≈ なるべく).

Use 早く.

• 早い/早く: early/soon (time), and sometimes “quickly” in casual contexts.
• 速い/速く: fast/at high speed (pace). With finishing work, 早く終わらせたい is “want to finish early/ASAP.” If you wanted to stress speed of action, 速く might appear with verbs like 走る (to run).

No. Although with simple verbs you sometimes see the “object marked by が” pattern (e.g., 寿司が食べたい), it doesn’t work with 終わらせる here. Use 仕事を終わらせたい/終えたい.

• ✔ 寿司が食べたい / 寿司を食べたい (both okay; が highlights what you want)
• ✕ 仕事が終わらせたい (ungrammatical)
• ✔ 仕事が終わった (the work has ended)

Broadly:

• 会議: “meeting/conference” with a formal or official feel (agendas, decisions).
• ミーティング: borrowed word, often smaller, informal, quick syncs. In many workplaces they overlap, but 会議が多い sounds like a busy, meeting-heavy schedule in a more formal sense.