S2 English | Conditionals (zero, first, second) Lesson-Prep Guide

S2 English | Conditionals (zero, first, second) Lesson-Prep Guide | if-clause tense, unless, 4 mistakes

2026-11-12

Tutor lesson-prep guides · Secondary English (DSE)

Students write “If it will rain, I will stay home” and use would for things that really can happen. This lesson does three things: read the if-clause tense first, sort the three types on one three-row table, and rewrite unless as if not before naming the type.

Objectives — Students can: (1) state the if-clause and main-clause patterns for all three types (zero: present + present; first: present + will + base verb; second: past + would + base verb) and sort five sentences correctly; (2) explain that zero conditionals state general truths and habits, first conditionals describe real future possibilities, and second conditionals describe unreal or imaginary present situations; (3) explain that will never appears in the if-clause and that would is always followed by a base verb; (4) rewrite unless as if not and then name the type; (5) complete five classifications with written reasons in forty seconds using the three-row table.

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?	Add s or es, as in goes and watches
Past simple	What is the past simple of go?	went
will / would	Which verb form follows will?	The base form, with no s and no ed

02 Lesson flow (45 minutes)

Time	Stage	Tutor does	Student does
0-5 min	Wrong sentence first	Write “If it will rain, I will stay home” and ask students to find the word that cannot sit in an if-clause	Call out will
5-15 min	Three-row table	Draw three rows: if-clause tense, main-clause pattern, meaning; fill in zero, first and second	Copy the table
15-26 min	Sort five sentences	Model the sort, insisting on naming the if-clause tense before naming the type	Sort five in pairs
26-36 min	Unless rewrite	Model the two steps: unless becomes if, then negate the verb; name the type only afterwards	Rewrite three sentences
36-41 min	Four error pairs	Show four wrong answers; students say which clause is wrong; tutor adds one line	Explain one error
41-45 min	Exit check	Collect three items, mark on the spot, name the act to reteach	Hand in three items

03 Teaching script (read it out)

Scene 1: Act 1: the if-clause is the switch

“There is only one way into a conditional: read the tense in the if-clause. If the if-clause is present, two types are possible. When the main clause is also present, it is a zero conditional, stating a truth or a habit. When the main clause is will, it is a first conditional, describing a real future possibility. If the if-clause is past and the main clause is would, it is a second conditional, describing something unreal or contrary to the present. So the first move is not translation; it is circling the verb in the if-clause and writing its tense. The most expensive error is putting will inside the if-clause: English uses the present there for future meaning, so “If it will rain” is always wrong. The second is misreading the second conditional as past time: “If I had a car” means I do not have one now, not that I had one before.”

Read the if-clause tense first; will never sits in the if-clause.

Scene 2: Act 2: one real example for each type

“Zero: If you heat ice, it melts. Heating ice always melts it, so both clauses are present. First: If it rains tomorrow, we will cancel the match. Rain is possible but not certain, so the if-clause is present and the main clause takes will. Second: If I were you, I would apologise. I am not you, so the situation is contrary to the present; the if-clause takes past and the main clause takes would. Students write “If I would be you” constantly, so give them one rule: would never appears in the if-clause. In the second conditional, be is always were in writing, even though was is common in speech. Every answer needs both the pattern and one sentence of meaning; a pattern alone is an unfinished answer.”

Zero for truths, first for real possibilities, second for unreal ones; would stays out of the if-clause.

Scene 3: Act 3: unless means if not, so name the type after rewriting

“Unless is the word students most often handle on autopilot. It is already negative, so unless you hurry means if you do not hurry, and adding another not produces a double negative. The rewrite has two steps: swap unless for if, then negate the verb, so hurry becomes do not hurry and is becomes is not. Only then name the type: If you do not hurry, you will be late is still a first conditional, because the if-clause is present and the main clause takes will. Students often swap the word and forget the not, which reverses the meaning, or push the not into the main clause, which changes what the sentence claims. Remind them that unless never takes will either; the same rule applies.”

Unless becomes if plus not; the negative belongs in the if-clause.

04 Question types and worked steps

Type	Example	Steps	Answer
Identify the type	Which type is “If you heat ice, it melts”, and why?	(1) Circle heat (2) Write present (3) Check melts is also present (4) Answer zero with the reason of general truth	Zero conditional, because both clauses are present and it states a general truth
Fix the if-clause	Correct: “If it will rain, we will stay home.”	(1) Find the if-clause (2) Delete will (3) Put the verb in the present (4) Keep will in the main clause	If it rains, we will stay home.
Build a second conditional	Write “If I were you, I would apologise” using the second conditional.	(1) Use past in the if-clause (2) Use were for be (3) Use would + base verb (4) Check would is not in the if-clause	If I were you, I would apologise.
Rewrite unless	Rewrite “Unless you hurry, you will be late” with if.	(1) Swap unless for if (2) Negate hurry (3) Keep will be late (4) Re-read to check the meaning	If you do not hurry, you will be late.

Sanity check (teach this): Reasonableness checks: (1) will inside the if-clause is wrong except inside an embedded noun clause. (2) A first conditional main clause takes will plus the base verb, never will to go. (3) The second conditional uses were for be in writing. (4) unless plus not is a double negative and reverses the meaning. (5) A zero conditional keeps the present in both clauses, so will in the main clause signals a wrong type.

05 Independent practice (3 questions)

Question	Answer	What to watch
Which type is “If she studies harder, she will pass”?	First conditional: present in the if-clause, will in the main clause	Did they name both tenses?
Correct: “If I would have time, I would join.”	If I had time, I would join.	Was would removed and the past form used?
Rewrite “Unless it stops raining, the match will be cancelled” with if.	If it does not stop raining, the match will be cancelled.	Is the not inside the if-clause?

06 Common mistakes and what to say

Mistake	Student writes	Say this
will in the if-clause	“If it will rain, I will stay.”	Use the present in the if-clause; will belongs to the main clause.
would in the if-clause	“If I would be rich, I would travel.”	Second conditional: past in the if-clause, would in the main clause.
unless plus not	“Unless you do not hurry, you will be late.”	unless is already negative; keep the verb positive.
second conditional read as past	“If I had a car” translated as I had one before	It describes an unreal present: if I had one now.

07 Homework (paper, section and question numbers)

Conditional practice, questions 1-4 on this page — Circle the if-clause tense first; only move on when all four are right
Prep-guide master index — The same tense-first routine works for time clauses
Redo this lesson — Write six sentences, two per type, one of them rewritten from unless

08 Exit check (last 5 minutes)

Question	Answer	Decision
What are the three patterns?	Zero: present + present; first: present + will; second: past + would	Any wrong row means reteach Act 2
Can will appear in the if-clause?	No, the present carries future meaning there	Yes means reteach Act 1
What are the two steps for unless?	Swap unless for if, then negate the verb	A missing not means reteach Act 3

09 Tutor FAQ

Can I teach only the first conditional?

No. Teach all three together so students use one entry point, the if-clause tense, instead of memorising examples.

How do I stop students confusing the second conditional with the past?

Ask for a translation with the word now: if the meaning is present, it is a second conditional.

Should I add the third conditional?

Not in S2. It needs past perfect plus would have done; keep it for S4 so the three basic types settle first.

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.