All, both, and half are determiners that refer to whole groups or quantities — all of something, both of two things, or half of something. They appear frequently in everyday English but cause persistent errors in three areas: position in the sentence (before or after the noun and article), verb agreement, and the choice between all/all of, both/both of, and half/half of. Understanding these structures clearly will help you use them naturally and explain them accurately to learners.
Before you start — think honestly about your own teaching and experience.
Look at the examples. Answer each question before reading the explanation — this is how your students will learn too.
All three sentences mean the same thing — every student must attend. But the form is different each time. When would you use each version? Is one more formal than another?
All + plural noun (without the) is used for a general, unspecified group: All students must attend — meaning students in general, any students. All the + plural noun is used for a specific group that both the speaker and listener know about: All the students (the specific students in this school/class). All of the + plural noun means exactly the same as all the — the of version is slightly more formal or emphatic. In practice, all the and all of the are interchangeable with specific groups. The most common error is saying all of students (omitting the) — the article must appear after all of. This is a consistent rule: all of must be followed by the, a possessive (all of my, all of their), or a pronoun (all of them).],
Both teachers are present in all three sentences. What is the difference between the three forms? And what is the most important thing to know about what both refers to?
Both always refers to exactly two people or things — never three or more. For three or more, all is used. Both, both the, and both of the are largely interchangeable and follow the same pattern as all/all the/all of the. The key rules: both is always followed by a plural noun and a plural verb (both teachers were, not was). Both of must be followed by the or a possessive or pronoun (both of the teachers, both of them — not both of teachers). Because both refers to two things, it always takes a plural verb: Both teachers are ready (never is).
Look at the verbs in these sentences. In the first sentence the verb is singular (has). In the second it is plural (have). In the third it is singular (was). What determines whether the verb is singular or plural after half?
With half, verb agreement depends on the noun that follows, not on half itself. Half the class (class — singular noun) takes a singular verb: has finished. Half of the students (students — plural noun) takes a plural verb: have submitted. Half a lesson (lesson — singular noun) takes a singular verb: was lost. This mirrors the rule for a lot of: look at the noun that follows the determiner and make the verb agree with that noun. This is one of the clearest cases where the noun head, not the quantifier, determines agreement. Half can also appear before a or an before a singular countable noun: half a lesson, half an hour — this is a common, fixed structure.'
| Form | Use / Meaning | Example |
|---|---|---|
| Structure | Example | Notes |
| all + plural noun | All students must register. | General, unspecified group — no article needed |
| all the + plural noun | All the students must register. | Specific known group — article required |
| all of the + plural noun | All of the students must register. | Same as all the — slightly more formal |
| both + plural noun | Both teachers were present. | Exactly two — always plural verb |
| both of the + plural noun | Both of the teachers were present. | Of must be followed by the, possessive, or pronoun |
| half + noun | Half the class finished early. | Verb agrees with the noun that follows half |
| half of the + noun | Half of the students have submitted. | Same agreement rule: verb agrees with the following noun |
ALL WITH UNCOUNTABLE NOUNS
All can also be used with uncountable nouns, where it means the whole amount: All the information was correct. All the furniture was moved. In this case, the verb is singular because the uncountable noun is singular. This is a natural extension of the all + specific noun rule and follows the same agreement principle.
ALL DAY, ALL WEEK, ALL YEAR — FIXED EXPRESSIONS
All appears in many fixed time expressions where it means the entire period: all day, all morning, all week, all term, all year. These expressions do not take an article: She worked all day (not all the day). The teacher prepared all week for the inspection. These are high-frequency in informal and formal English and worth teaching as fixed chunks.
BOTH...AND AS A CORRELATIVE CONJUNCTION
Both can also function as a correlative conjunction paired with and: Both the head teacher and the inspector were satisfied. In this structure, both emphasises that two things are equally true. The verb agrees with the nearest or most natural subject. This use is covered more fully in sentence structure lessons but teachers should recognise it.
WHICH FORM DO I NEED? - Referring to a general, unspecified group? All + plural noun (no article). - Referring to a specific, known group? All the + plural noun OR all of the + plural noun. - After all of or both of — is the next word the, a possessive, or a pronoun? It must be — never a bare noun. - Is the reference to exactly two things? Use both (plural verb). - Is the reference to three or more? Use all. - After half — what is the noun? Singular noun → singular verb. Plural noun → plural verb.
Choose the correct form to complete each sentence.
Each sentence has one error with all, both, or half. Write the correct sentence and explain the mistake.
Use this sequence directly in class — guided discovery, no textbook needed. Tap each step to mark it done.
STEP 1 — ALL: THREE FORMS (7 minutes): Write three versions on the board: All students / All the students / All of the students. Ask learners: what is different? When would you say each one? Establish: no article = general group, the = specific group, of the = same as the, slightly more formal. Then write: All of students — ask: what is wrong here? Establish the rule: after all of, the must follow.
STEP 2 — BOTH: ALWAYS TWO (6 minutes): Ask learners to think of two colleagues. Say: Both of my colleagues attended the meeting. Now ask: what if there are three colleagues? Guide learners to switch to all. Confirm: both = exactly two, always plural noun, always plural verb. Write both + singular noun on the board (both teacher) and ask learners to correct it.
STEP 3 — HALF: VERB AGREEMENT (7 minutes): Write three sentences with half and ask learners to choose is/are or was/were for each. After each answer, ask: what is the noun after half? Is it singular or plural? The noun determines the verb. Use school contexts: half the class, half of the teachers, half a lesson, half the equipment.
STEP 4 — ALL/BOTH WITH PRONOUNS (7 minutes): Introduce the pronoun position: all of them, both of them, and also they all, they both. Write four sentences and ask learners to rewrite each one using a pronoun structure. For example: All the teachers left → All of them left / They all left. Discuss which sounds more natural in each context.
STEP 5 — PRODUCE AND CHECK (8 minutes): Ask learners to write five sentences about their school using all, both, and half (at least one of each). They must include one all of the construction and one half sentence requiring a verb choice. Share with a partner for peer checking. Address any errors in the of + article structure or verb agreement.
Use directly in class — copy, adapt, or read aloud. No printing needed.
For each strategy, choose the option that best describes where you are now.
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