「keep」一直在變：Up、On、Off、Away

「keep」是那個不肯放手的動詞。它會抓住、會持續、會保存、會拖延、會保護，偶爾還像個一臉認真的警衛擋在門口。加上介副詞，它變得更忙：keep up with the class、keep on talking、keep off the grass、keep away from trouble。這個動詞穩定的核心沒變，但每個介副詞決定被維持的是什麼：速度、行動、距離，還是隔離。

快速解答

keep 的核心是「維持一種狀態」。Keep up 表示維持水準、速度或標準。Keep on 表示繼續做某事，常帶著一股堅持的意味。Keep off 表示不踏上某個表面，或不讓某物碰到。Keep away 表示保持距離，或不讓某人靠近。只要問「被維持的是什麼狀態？」，這些意思就不再那麼滑溜。

核心概念

單純的 keep 已經有很多用法：keep a receipt、keep quiet、keep someone waiting、keep a promise。共同的概念是延續：某件事在一段時間內持續為真。

介副詞讓這份延續有了焦點。Up 維持高度、節奏或標準。On 維持進行中的動作。Off 維持與某個表面或話題的隔離。Away 維持與某個人、地方、危險或誘惑的距離。

這個家族講的不太是劇烈的移動，而是控制。當有人想讓局面保持穩定時，英文就會用上它。

Keep Up

keep up：維持同樣的速度或水準

這在學校、職場、運動和對話中都很常見。

"I walk fast, so tell me if you can't keep up."
"The course moves quickly, but she's keeping up."
"Prices keep going up, and salaries can't keep up."

要說出你想跟上的對象時，keep up with 的結構非常常用。

"It's hard to keep up with all the emails."
"He keeps up with technology by reading every day."
"Can you keep up with the speaker's pace?"

不加 with 時，對象通常可以從情境中意會："You're doing fine. Keep up."

keep up：維持好表現

你常會在鼓勵的話裡聽到這個用法。

"Your pronunciation has improved. Keep it up."
"The team played well in the first half and needs to keep it up."
"Great work. Keep up the effort."

"Keep it up." 表示繼續做那件好事。如果那件「事」是壞事，它也可以變成警告："Keep it up and you'll be in trouble." 情境會改變語氣。

Keep On

keep on：繼續做

這接近 continue，但更口語。

"The baby kept on crying."
"He kept on asking the same question."
"Even after the mistake, she kept on playing."

它後面通常接 -ing 動詞：keep on trying、keep on talking、keep on moving。這個片語可以聽起來令人佩服，也可以令人煩躁。

佩服："She kept on training after the injury."
煩躁："He kept on interrupting me."

動作越過了大家以為它會停下的那個點，還在繼續。

keep on：沿著路線繼續走

這個用法比較少見，但很實用。

"Keep on this road until you see the station."
"Keep on straight for two blocks."

這裡的 on 表示留在路徑上。

Keep Off

keep off：不踏上某個表面或區域

這就是告示牌上的意思："Keep off the grass."

"Please keep off the freshly painted floor."
"The doctor told him to keep off his injured ankle."
"The sign says to keep off the rocks near the water."

這可以是字面而具體的：不要踩、不要坐、不要爬，也不要把重量放上去。

keep off：不讓某物碰到或影響

這時主詞可能在保護某人或某物。

"This jacket keeps off the rain."
"The curtains keep off the afternoon sun."
"A password helps keep strangers off your account."

這個片語的拆法和 "turn off" 不太一樣。通常的句型是讓某人或某物遠離某個地方："keep kids off the roof"、"keep dust off the shelves."

keep off：避開話題或習慣

在對話裡，keep off 可以表示避免討論某件事。

"Let's keep off politics tonight."
"Try to keep off your phone during dinner."
"He's been keeping off sugar this month."

它不像 "avoid" 那麼通用，但在合適的情境裡非常自然。

Keep Away

keep away：保持距離

這個意思講的是距離，常常是為了安全。

"Keep away from the edge."
"The dog is nervous, so keep away for now."
"Children should keep away from the construction area."

要說出危險或地點時，用 from："keep away from the fire."

keep away：不讓某人或某物靠近

主詞也可以是製造距離的那一方。

"The smell keeps mosquitoes away."
"The fence keeps people away from the tracks."
"I keep snacks out of the house to keep temptation away."

這個句型很常見：keep + 受詞 + away。代名詞同樣放中間："keep them away."

keep away 與 keep off 的差別

這兩個常常感覺很接近。差別通常在「表面」與「距離」。

"Keep off the grass." = 不要踩上草地。
"Keep away from the grass." = 不要靠近草地。

如果問題出在碰到或站上某樣東西，off 是自然的選擇。如果問題是靠近它，away 更貼切。

常見錯誤

"I can't keep up all the emails." → "I can't keep up with all the emails." · 要跟上源源不絕的事物，通常需要 with。
"He kept to talk." → "He kept on talking" 或 "He kept talking." · Keep on 後面接 -ing。
"Keep away the wet floor." → "Keep off the wet floor." · 不該踩上去的表面用 off。
"This spray keeps off mosquitoes away." → "This spray keeps mosquitoes away." · 介副詞不要疊著用。
稱讚別人時說 "Keep it on!" → "Keep it up!" · 延續好表現是 keep it up。

小練習

The class is fast, but I'm trying to keep _____.
He kept _____ checking his messages during the movie.
Please keep _____ the grass until it grows back.
This cream keeps insects _____.
Your writing is getting clearer. Keep _____ _____.

解答

up — 維持節奏是 keep up。
on — 持續一個動作是 keep on 加 -ing。
off — 不踏上表面是 keep off。
away — 和昆蟲保持距離是 keep away。
it up — 延續好表現是 keep it up。

小結

片語	核心意思
keep up	維持節奏、水準或表現
keep on	繼續做
keep off	不踏上／不讓接觸
keep away	保持距離／不讓靠近

遇到 keep，要問的不是「它往哪裡去？」，而是「什麼狀態在延續？」節奏在延續，動作在延續，距離在延續，或者隔離在延續。這就是這個家族的模式。

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