These three words sound the same in many accents, but they serve different grammar jobs. To most often marks direction or an infinitive verb. Too expresses “also” or “more than needed.” Two is the number 2, used for counting and quantities.

Use to to show movement, direction, or a destination. It commonly appears after verbs like go, come, walk, travel, and send. It can also show a target or recipient of an action, especially with give, bring, hand, and explain.

Rule	🇨🇳 中文 规则	Example	🇨🇳 中文 示例
Use to for destination after movement verbs.	📌 使用 To 表示在移动动词之后的目的地。	We went to the park.	➡️ We went to the park.
Use to for a recipient or target.	📌 使用 To 表示接收者或目标。	She gave the keys to her sister.	🎁 她把钥匙给了她的妹妹。
Use to for direction in phrases like to the left, to the right.	📌 在像 to the left、to the right 这样的短语中表示方向。	Turn to the right.	🧭 向右转。

Use to before the base form of a verb to create the infinitive: to + verb. Infinitives can express purpose, plans, decisions, or what someone wants or needs. Many verbs are naturally followed by an infinitive, such as want, need, hope, decide, and plan.

Rule	🇨🇳 中文 规则	Example	🇨🇳 中文 示例
Use to + base verb for purpose.	📌 使用 to + 基本动词表示目的。	I called to ask a question.	🎯 I called to ask a question.
Use to + base verb after verbs like want, need, decide.	📌 在像 want、need、decide 这样的动词之后使用 to + 基本动词。	They decided to leave early.	📝 They decided to leave early.
Use to + base verb after adjectives like happy, ready, hard.	📌 在像 happy、ready、hard 这样的形容词之后使用 to + 基本动词。	I am ready to start.	✅ I am ready to start.

Use to in time expressions to show a point up to a limit, often in telling time or schedules. It commonly appears as X minutes to Y o’clock, meaning the time is before the next hour. It can also show a range, like from Monday to Friday.

Rule	🇨🇳 中文 规则	Example	🇨🇳 中文 示例
Use to for time before an hour.	📌 在一个小时之前的时间表达中使用 To。	It is ten to six.	🕒 It is ten to six.
Use from … to … for ranges.	📌 使用 from … to … 来表示范围。	The office is open from Monday to Friday.	📅 The office is open from Monday to Friday.

Use too to mean “also” or “as well.” In this meaning, it often appears at the end of a sentence, but it can also appear after the subject for emphasis. Too connects an extra person, thing, or fact to what was already said.

Rule	🇨🇳 中文 规则	Example	🇨🇳 中文 示例
Put too at the end to mean also.	📌 将 too 放在句末表示 also。	I want to go too.	🙋 I want to go too.
Put too after the subject for emphasis.	📌 将 too 放在主语之后以强调。	She too agreed.	🧑‍🤝‍🧑 She too agreed.

Use too to mean “more than needed” or “more than is good.” This too usually comes before an adjective or adverb, or before much or many. It often implies a problem or negative result, and it commonly pairs with to in patterns like too + adjective + to + verb.

Rule	🇨🇳 中文 规则	Example	🇨🇳 中文 示例
Use too before an adjective or adverb for excess.	📌 在形容词或副词前使用 too，表示过量。	This soup is too hot.	🔥 This soup is too hot.
Use too much with uncountable nouns.	📌 对不可数名词使用 too much。	There is too much sugar.	☕ 糖太多了。
Use too many with countable plural nouns.	📌 对可数复数名词使用 too many。	He gets too many emails.	📨 He gets too many emails.
Use too + adjective + to + verb for an impossible or difficult result.	📌 使用 too + 形容词 + to + 动词，表示不可能或困难的结果。	It is too far to walk.	🚗 走路太远，走不了了。

Use two for the number 2 in counting, quantities, and measurements. It modifies plural nouns and answers “how many.” It also appears in set phrases and number-based expressions.

Rule	🇨🇳 中文 规则	Example	🇨🇳 中文 示例
Use two before a plural noun.	📌 在复数名词前使用 Two。	I bought two apples.	🍎 我买了两个苹果。
Use two for measurements and time.	📌 用 Two 表示测量和时间。	The meeting lasts two hours.	⏱️ 会议持续两小时。
Use two in common quantity phrases.	📌 在常见数量短语中使用 Two。	She has two choices.	✌️ 她有两个选择。

The three words appear in different typical positions because they have different functions. To usually comes before a noun phrase or a verb in the infinitive. Too meaning also often goes at the end or after the subject. Two usually comes before a plural noun or stands alone as a number.

Word/Phrase	🇨🇳 中文 单词/短语	Definition	🇨🇳 中文 定义	Example	🇨🇳 中文 示例
to + place	➡️ to + place	destination or direction	📍 目的地或方向	We drove to Boston.	➡️ We drove to Boston.
to + verb	🎯 to + verb	infinitive form	🧩 不定式形式	I need to sleep.	🎯 I need to sleep.
too at end	➕ too at end	also or as well	🗣️ 也或同样	I like it too.	➕ I like it too.
too + adjective	⚠️ too + adjective	excessive amount or degree	📈 过量或程度	It is too loud.	⚠️ It is too loud.
2️⃣ two + noun	2️⃣ two + noun	quantity of two	🔢 数量为两	2️⃣ Two tickets, please.	2️⃣ Two tickets, please.

Pick the word by identifying the meaning you need. If it introduces a destination, direction, or infinitive verb, use to. If it means also or an excessive degree, use too. If it is the number 2, use two.

Rule	🇨🇳 中文 规则	Example	🇨🇳 中文 示例
If you can ask where or which direction, use to.	🧭 如果你能问“哪里”或“哪个方向”，请使用 To。	She went to work.	🧭 She went to work.
If a verb follows and it means purpose or plan, use to.	🧩 如果跟在一个动词后，且表示目的或计划，请使用 To。	He stayed to help.	🧩 He stayed to help.
If it means also, use too.	➕ 如果表示也，请使用 Too。	Can I come too?	➕ Can I come too?
If it means more than needed, use too.	⚠️ 如果表示超出需要，请使用 Too。	You are driving too fast.	⚠️ You are driving too fast.
If it answers how many, use two.	🔢 如果它回答有多少，请使用 Two。	We need two chairs.	🔢 We need two chairs.

In many varieties of English, to, too, and two can sound the same in careful speech. In fast speech, to is often reduced and may sound like a weaker vowel, especially before a verb. Too and two usually keep a stronger vowel sound, especially when stressed.

Rule	🇨🇳 中文 规则	Description	🇨🇳 中文 描述	Notation	🇨🇳 中文 标记	Example	🇨🇳 中文 示例
Reduced to	🔊 缩略为	In fast speech, to before a verb is often unstressed and reduced.	🗣️ 在快说话中，动词前面的 to 常常不重读且被弱化。	tə or tʊ	tə 或 tʊ	I want to go.	🔊 I want to go.
Stressed too	🔊 强读 Too	Too often stays strong when it means also or excessive.	🗣️ Too 在表示 also 或过量时通常保持较强的元音。	tuː	tuː	It is too cold.	🔊 It is too cold.
Stressed two	🔊 强读 Two	Two is usually stressed when counting or giving quantities.	🗣️ Two 在计数或给出数量时通常被重读。	tuː	tuː	Two coffees, please.	🔊 Two coffees, please.