If you want to make sure you will have a table to eat at a restaurant, you can reserve it or make a reservation in advance to make sure you have a spot. "Reserve" is a verb, so you can reserve a hotel room, a seat on a flight, or a table for two at a restaurant. "Make a reservation" is a noun phrase, so you'd say, "I made a reservation for dinner tonight." You can also use "book" instead of "reserve," like "I booked a hotel room for the weekend." If something is already taken, we say it's "fully booked" or "reserved." So, if you call a restaurant and they say, "Sorry, we're fully booked," that means no tables are available!

在日常生活中，如果你想先行「預留」或「預約」某項服務，你可以使用 reserve、book 或 make a reservation 這三種說法。reserve 和 book 都是動詞，意思差不多，reserve 稍微正式一點，而 book 聽起來比較口語，例如 'We reserved seats online.' 或 'I'd like to book a table for two at 7 p.m.'；至於 make a reservation 則是片語，用動作動詞 make 加上名詞 reservation，常見於較正式或書面場合，比如 'Have you made a reservation for the meeting room?'。簡單來說，這三者都表示事先替自己保留位置、房間、餐桌或票券，用起來非常實用，只要記得後面接的東西通常是要保留的項目或 for + 人即可。

“As long as” means something will happen or be true only if a certain condition is met. It’s like saying “only if.” For example, “You can go out as long as you finish your homework.” It’s a way to set a rule or condition in a friendly way, kind of like saying, “Sure, but just make sure you do this first.”

「as long as」這個片語最常見的意思就是「只要…就…」，用來表達某件事成立的條件或前提，語氣上通常帶點輕鬆、允許或保證的感覺。例如："You can borrow my bike as long as you bring it back by 6 p.m."（只要你在晚上六點前把腳踏車還給我，就可以借走）、"As long as you keep practicing, your English will improve."（只要你持續練習，你的英文就會進步）。在句型上，as long as 後面接一個完整子句，並且可以放在句首或句中；若放句首，要用逗號與主句分開，像："As long as you’re happy, I’m happy." 它也有「和…一樣長」的字面意思，但在口語裡較少這樣用。與它意思相近的還有 "so long as"，兩者幾乎可以互換，只是 "as long as" 更口語一點。記得不要把它誤解成單純表示時間長短，而忽略了「條件」這層意義喔！