English: sentence formation, agreement and punctuation
| English | Português |
|---|---|
| independent clause/ˌɪndɪˈpendənt klɔːz/ | independent clause |
| dangling modifier/ˈdæŋɡəlɪŋ ˈmɒdɪfaɪə/ | dangling modifier |
A decision before an answer
- In “The box of old maps is heavy,” box controls the verb. The nearby plural noun maps does not.
- Your goal: Distinguish complete clauses, fragments and comma splices.
Read the relationship
- A complete independent clause has a subject and finite verb and can stand alone. A dependent clause introduced by although or because needs a main clause. Join independent clauses with a period, a semicolon, or a comma plus an appropriate coordinating conjunction. A comma alone generally creates a comma splice. A semicolon does not repair a fragment.
- Locate the grammatical subject despite intervening phrases.
Choose the grammatical sentence.
Singular box controls is, with no comma between subject and verb.
Use the defining rule
- Identify the head of the subject rather than the nearest noun. Prepositional phrases and inserted comments may separate it from the verb. Pronouns must refer clearly to the intended antecedent and use the correct form in their grammatical role. Keep verb tense consistent with the actual sequence of events rather than mechanically making every verb identical.
- Punctuate boundaries and modifiers according to structure.
Which joins two complete clauses correctly?
A semicolon separates two independent clauses.
Check the conditions
- Use paired commas for a nonessential inserted element and avoid commas separating a subject from its verb. A colon can introduce an explanation or list after a complete clause. Apostrophes mark possession or omitted letters, not ordinary plurals. Punctuation choices must be judged in the entire sentence, including material outside the selected span.
- Punctuate boundaries and modifiers according to structure.
Original editing case: “Although the archive was small. Its collection of local maps were extensive, visitors could compare several editions. Examining a faded sheet, a spelling error surprised Lena.” Revision: “Although the archive was small, its collection of local maps was extensive; visitors could compare several editions. Examining a faded sheet, Lena noticed a spelling error.” The first dependent clause now connects to a main clause. Collection is singular, so was agrees. A semicolon joins the two complete clauses. Lena becomes the subject described by examining.
In “A collection of letters ____ available,” use “is” or “are”.
Collection is the singular head of the subject.
Apply the task format
- Modifiers should attach to what they describe. In “Walking into the archive, the map caught Lena’s attention,” the introductory modifier wrongly makes the map the walker. Revise to “Walking into the archive, Lena noticed the map.” Parallel items should use compatible grammatical forms. Identify the structural error before comparing surface wording.
- Punctuate boundaries and modifiers according to structure.
A pause is not a punctuation rule. Identify clause boundaries, modifier attachment and subject–verb relationships.
Which answer fits this case?
Distinguish complete clauses, fragments and comma splices
A semicolon can join any two word groups.
Both sides ordinarily need complete independent clauses.
Keep the distinctions
- independent clause 独立分句 — A subject–verb group that can stand as a complete sentence.
- dangling modifier 悬垂修饰语 — A modifier whose intended subject is absent or wrongly attached.
- Distinguish complete clauses, fragments and comma splices.
- Locate the grammatical subject despite intervening phrases.
- Punctuate boundaries and modifiers according to structure.
Match each term with its precise meaning in this lesson.
Keep the distinctions stated in the teaching example.
Put this lesson’s reasoning or event sequence in order.
The order follows the stated process; check each stage before the next.