HKDSE English｜The Four Conditionals Lesson-Prep Guide (for tutors)｜Zero, first, second, third, mixed, unless and wish

2026-11-03

Tutor lesson-prep guides · Secondary English

Students can produce “if I will see him” and know the second conditional wants would, yet cannot say why, so a mixed conditional or a wish sentence collapses their tenses. This lesson uses one four-row table and one truth line to turn tense choice into a decision they can defend.

Objectives — Students can: (1) state the reality level and if-clause tense for each of the 4 conditional types and write all 8 arrangements (if-clause first or main clause first, with a comma only when if comes first); (2) separate the second conditional (unreal now) from the third (unreal then), producing “had + past participle, would have + past participle” correctly; (3) rewrite unless as if not, use the 3 wish patterns (present, past, future) with the right tense, and self-check with a 12-sentence drill of 3 sentences per type.

01 Prerequisites (3-minute check)

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

Skill	Quick check	Pass mark
Present simple	What ending does a third-person singular verb take?	s or es
Past forms	Give the past simple and past participle of see.	saw and seen
Modal verbs	What verb form follows would?	The bare infinitive, no to
Punctuation	What goes after an if-clause placed first?	A comma before the main clause

02 Lesson flow (60 minutes)

Time	Stage	Tutor does	Student does
0–8 min	The truth line	Real, possible, unreal now, unreal then	Decide reality before tense
8–18 min	Four-row table	4 types times two tense slots	Fill all eight cells
18–30 min	Clause order	8 arrangements, comma only when if is first	Same meaning, different punctuation
30–42 min	Unless and if not	Rewrite one as the other	Unless already carries the negative
42–52 min	Wish	3 patterns: now, past, future	Wish steps one tense back
52–60 min	Mixed conditionals and exit check	If I had studied, I would be…	Past cause, present result

03 Teaching script (read it out)

Scene 1: Ask about reality, not about tense

Draw the four types as a line: zero states a law (If you heat ice, it melts), first a real future (If it rains, we will stay), second an unreal present (If I were you, I would…), third an unreal past (If I had known, I would have…). Ask one question first: will this actually happen? Once the answer is fixed, only one tense pair fits. Students fail here on judgement, not on memory.

Ask: in “If I were a bird”, is the speaker a bird? (No, so were)

Scene 2: Fill eight cells, then vary the order

The table has one row per type and two tense columns, 8 cells in all. Then write the same sentence twice: if-clause first with a comma, main clause first without one, giving 8 arrangements with identical meaning. Let students notice that the comma follows the position of if, not the mood of the sentence.

Ask them to invert “If I had known, I would have told you” and say whether the comma survives

Scene 3: Close with unless and wish, and catch the two classic errors

Unless means if not, so “unless you hurry” already carries the negative; adding not reverses the meaning. Wish steps back one tense: unreal present takes the past simple (I wish I knew), unreal past takes the past perfect (I wish I had known), future wishes take would (I wish he would call). The present simple never appears after wish, because wish itself means it has not happened.

Ask: what is wrong with “I wish I have more time”? (Wish needs a step back: had)

04 Question types and worked steps

Type	Example	Steps	Answer
Gap fill: tense choice	If it ___ (rain) tomorrow, we ___ (cancel) the trip.	Judge reality: possible tomorrow means first conditional	rains and will cancel
Rewrite: unless to if not	Unless you book now, you will lose the seat.	Move the negative into the if-clause	If you do not book now, you will lose the seat.
Combine: mixed conditional	I did not study last year. I am not a doctor now.	Past cause, present result: past perfect plus would plus base	If I had studied last year, I would be a doctor now.
Judge: wish pattern	I wish I ___ (not / spend) so much last week.	A past regret takes the past perfect	had not spent

Sanity check (teach this): The four types are four degrees of reality, not four formulas; will never appears in the if-clause; the second conditional uses were for every subject; the third conditional needs had plus past participle on both sides; unless already contains the negative; wish always steps one tense back, so the present simple is always wrong there; a mixed conditional has one past clause and one present clause; all 8 arrangements mean the same thing and differ only in the comma; the 12-sentence drill must cover 3 sentences per type to test all four.

05 Independent practice (3 questions)

Question	Answer	What to watch
Rewrite with unless: If you do not leave now, you will miss the bus.	Unless you leave now, you will miss the bus.	Unless absorbs the not, the main clause is unchanged
Fill in: If I ___ (be) taller, I ___ (join) the team.	were and would join	Unreal present takes were plus would
Judge: I wish it ___ (stop) raining tomorrow.	would stop	Future wishes take would plus the base form

06 Common mistakes and what to say

Mistake	Student writes	Say this
Putting will in the if-clause	A student writes “If it will rain, we will stay”.	Tutor line: “will lives in the main clause only. The if-clause states the condition, so it takes the present.”
Using was in the second conditional	A student writes “If I was you, I would apologise”.	Tutor line: “The second conditional is a hypothesis, so it is always were. I was you sounds like you really were me.”
Half-converting to the third conditional	A student writes “If I had known, I would tell you”.	Tutor line: “Past on both sides. Had known in front, would have told behind.”
Adding not after unless	A student writes “Unless you do not hurry, we will be late”.	Tutor line: “Unless is already if not. A second not turns it back into a positive and reverses the meaning.”

07 Homework (paper, section and question numbers)

Secondary English chapter index — Pick two conditional chapters, copy the four-row table and add your own examples
S5 English: essay time budget and concession — Turn two concession sentences from that chapter into second conditionals
S4 English: reading inference and tone — Use the passage in practice question 2 and rewrite one sentence with If I had…

08 Exit check (last 5 minutes)

Question	Answer	Decision
Can the if-clause take will?	No, will belongs to the main clause	Answering yes means reality is still unjudged
Which be-form does the second conditional use?	were, for every subject	Answering was means habit is winning
How is the third conditional main clause built?	would have plus past participle	would plus base means only half was changed

09 Tutor FAQ

Which year group?

S5 English, usable in grammar and writing lessons; S4 can start with the first two types.

How many formulas must be memorised?

Four types plus mixed, five patterns; the rest follows from the reality question.

Is there practice?

Three practice items with answers and explanations, plus three linked chapters for homework.

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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.