Senior English | Punctuation and Sentence Variety: a Tutor Prep Guide

Senior English | Punctuation and Sentence Variety: a Tutor Prep Guide | From comma splice to compound sentence

2026-11-06

Tutor lesson-prep guides · Secondary English

Students can write one correct English sentence, but the moment they write a paragraph the comma splice appears: two full sentences joined by a comma, while semicolons, colons and dashes are used as decoration. This lesson sets one rule — one main clause per sentence — and turns punctuation into a checkable move.

Objectives — Students will be able to: (1) recognise and repair comma splices and fragments, and explain why a comma cannot join two main clauses; (2) choose a semicolon, colon or dash from the relationship between the two clauses rather than by feel; (3) mix simple, compound and complex sentences in one paragraph so sentence length has rhythm instead of running long throughout.

01 Prerequisites (3-minute check)

If any of these fails, fix it before the lesson starts.

Skill	Quick check	Pass mark
Clause vs phrase	What separates a clause from a phrase	A clause has a subject and a verb; a phrase does not
Coordinators	Which group for / but / so belong to	Coordinating conjunctions, which can join two main clauses
A sentence	What the minimum of an English sentence is	One subject, one finite verb, complete meaning

02 Lesson flow (60 minutes)

Time	Stage	Tutor does	Student does
0-8 min	Diagnostic	12 sentences, 5 comma splices and 3 fragments	Circle them and say why
8-20 min	One main clause per sentence	A comma separates items, openers and non-defining clauses, never two main clauses	Rewrite six sentences
20-34 min	Semicolon, colon, dash	Semicolon for equals, colon for explanation, dash for an aside	Write two of each
34-48 min	Rewrite for variety	Turn a 90-word paragraph into 6-9 sentences, shortest 6 words, longest 24	Rewrite it themselves
48-56 min	Mark it	Language is 12 marks; each unfixed comma splice costs one, so 3 lost leaves 9	Self-assess
56-60 min	Exit check	Collect three items and mark live	Work independently

03 Teaching script (read it out)

Scene 1: Comma splices and fragments: set the one-main-clause rule first

Hand out 12 sentences: 5 are comma splices (41.7%) and 3 are fragments.
Define it plainly: a comma separates parts inside one sentence; it is not a joiner. Two complete sentences can only be joined three ways — a full stop, a semicolon, or a conjunction such as and, but, so, because.
Fragments come in two shapes: a subordinate clause standing alone (starting with because or although), and a participle phrase used as a sentence.
Repair in three fixed steps: find the two subject-verb pairs, decide the relationship, then choose a full stop, a semicolon or a conjunction.

Ask the student: are these two clauses equal, causal or concessive? The punctuation follows that answer.

Scene 2: Semicolon, colon and dash: choose by relationship, not by feel

Semicolon joins two clauses of equal weight that are closely related; keep the next word lower case.
Colon introduces an explanation, a list or a result, and must follow a complete sentence.
Dash marks an aside, a turn in tone or a punchline; at most once per paragraph, or the writing sounds spoken.
The line to teach: equals take a semicolon, explanations take a colon, asides take a dash, everything else takes a full stop.

Ask the student: colon or semicolon here? Name the relationship between the clauses first.

Scene 3: Sentence variety: turn 90 words into 6-9 sentences

Give a 90-word paragraph held together by “and”. The task is 6-9 sentences with at least one very short sentence and one over twenty words.
Short sentences land a point; long sentences carry a cause or a condition.
Check by writing each sentence length after it. If every sentence sits between 18 and 22 words, there is no rhythm and the marker reads it as flat.

Ask the student: which is the shortest sentence, and where does it land the point?

04 Question types and worked steps

Type	Example	Steps	Answer
Repair a comma splice	Two clauses joined by a comma	Find both subject-verb pairs, decide the link, add a full stop, semicolon or conjunction	The bus was late. We missed the opening.
Complete a fragment	Because the rain was heavy.	Attach a main clause or make it one	Because the rain was heavy, the match was cancelled.
Choose punctuation	A gap between two clauses	Equals to semicolon, explanation to colon, aside to dash	He had one weakness: he never checked his answers.
Rewrite for variety	A paragraph glued with “and”	Split, subordinate, keep one short sentence	6-9 sentences, shortest 6 words

Sanity check (teach this): Sanity check: 12 minus 5 comma splices and 3 fragments leaves 4 clean sentences, which matches the opening diagnosis that a third needs rewriting. Language marks drop from 12 to 9, a fair deduction because a comma splice is a sentence-level error rather than a spelling slip. A 90-word paragraph as 6-9 sentences averages 10 to 15 words, which fits S4 writing.

05 Independent practice (3 questions)

Question	Answer	What to watch
Repair six comma splices	Worksheet items 1-6	Was the meaning kept while the punctuation changed
Complete four fragments	Worksheet items 7-10	Was a subordinate clause still treated as a sentence
Rewrite a 90-word paragraph	Worksheet item 11	Were the sentence count, shortest and longest all hit

06 Common mistakes and what to say

Mistake	Student writes	Say this
Believing a comma can join two main clauses	Writing “The film started late, we missed the bus.”	A comma is not a conjunction. Separate them with a full stop, add and or but, or use a semicolon.
Capitalising after a semicolon	Writing “It rained; We stayed home.”	Keep it lower case: a semicolon still sits inside one sentence. Only a full stop earns a capital.
Putting a colon after a fragment	Writing “Because of the delay: we arrived late.”	The colon must follow a complete sentence; because of the delay is only a phrase.
Adding short sentences just for variety	Dropping “That was it.” into every paragraph	A short sentence has a job: landing a point or turning the argument. One per paragraph is enough.

07 Homework (paper, section and question numbers)

Secondary English chapter index — Compare grammar chapters
Prep guide master index — See how other chapters are built
Redo this chapter — Worksheet items 1-6 and the item 11 rewrite

08 Exit check (last 5 minutes)

Question	Answer	Decision
Can a comma join two complete sentences	No: use a full stop, a semicolon or a conjunction	Answering yes sends you back to act one
Why is “we” lower case after that semicolon	It is still one sentence; only a full stop earns a capital	Missing this sends you back to act two
What is the minimum number of sentences for the paragraph	6	Fewer than 6 means long sentences are still stacked

09 Tutor FAQ

My student writes good ideas but loses language marks. Should we drill grammar exercises?

No. Language marks track sentence control and punctuation, so rewriting a real paragraph beats single-sentence gap fills, because the student has to decide where sentences end.

Can “and” replace a semicolon?

Yes, the meaning is close. A semicolon reads more equal and more formal. Both are accepted, but avoid three semicolons in one paragraph.

Does sentence variety make writing sound artificial?

It can, when done for its own sake. The rule is that length follows content: long for causes, short for conclusions.

Find a tutor — free Tutor Registration →

A TutorZone lesson-prep guide. Written by the TutorZone team; questions and lesson flow are original and are not taken from any school or publisher material.