If clause 123 for m.5/1-9

TYPE 1 : Future possible/Possible Condition expresses a possibility for the PRESENT or FUTURE

ความเป็�นไป็ได้�ในอนาคต เป็�นการคาด้การณ์�ล่�วงหน�าว�าเหต�การณ์�หร�อการกระทำ�าน��นอาจจะเก ด้ขึ้"�นใน

อนาคต(เง�#อนไขึ้ทำ$#เป็�นไป็ได้�) IF + PRESENT SIMPLE + FUTURE SIMPLE

If+ S+V1, S+ willwill/ shall/may/can +V infinitive

Example: She can do it if someone helps her. If the weather is nice, we will go to the park.

If-ClauseIf-Clause Main ClauseMain Clause

Present SimplePresent Simple

Future SimpleFuture SimpleorInfinitiveInfinitiveorModal + InfinitiveModal + Infinitive

FormationFormation

ExamplesExamples

If-ClauseIf-Clause Main ClauseMain Clause

If I studystudy, I will passwill pass the exams.

If you see see John tonight, telltell him to e-mail me.

If Ben gets up gets up early he can catch can catch the bus.

They will visit Eiffel Tower if they go to France.

If she tries hard, she will succeed.

TYPE 2: Present-UnrealPresent-Unreal / / Impossible ConditionImpossible Condition

IMPROBABLE OR UNREAL SITUATION in the present or future.

• เง�#อนไขึ้ทำ$#ตรงก�นขึ้�ามก�บความเป็�นจร งทำ$#เก ด้ขึ้"�นเง�#อนไขึ้ทำ$#ตรงก�นขึ้�ามก�บความเป็�นจร งทำ$#เก ด้ขึ้"�นในในป็&จจ�บ�นป็&จจ�บ�น//อนาคอนาคต กล่�าวค�อ เป็�นเง�#อนไขึ้ทำ$#เหต�การณ์�น��นไม�ม$ทำางเก ด้ขึ้"�นได้�แน�ๆ ต กล่�าวค�อ เป็�นเง�#อนไขึ้ทำ$#เหต�การณ์�น��นไม�ม$ทำางเก ด้ขึ้"�นได้�แน�ๆ เป็�นเร�#องทำ$#สมม�ต ขึ้"�นมาล่อยๆเทำ�าน��น เป็�นเร�#องทำ$#สมม�ต ขึ้"�นมาล่อยๆเทำ�าน��น ((เง�#อนไขึ้ทำ$#เป็�นไป็ไม�ได้�เง�#อนไขึ้ทำ$#เป็�นไป็ไม�ได้�MAIN CLAUSEIF CLAUSE

Subject + would + V.1If + past simple If I knew her name, I would tell you. (ถ้�าฉั�นรู้ �ชื่��อเธอ ฉั�นก็�น�าจะบอก็คุ�ณ) [จรู้�งๆ แล้�วไม่�รู้ �จ�ก็ชื่��อเธอ]She would be safer if she had a car. (เธอน�าจะปล้อดภั�ยก็ว�าน%& ถ้�าเธอม่%รู้ถ้) [จรู้�งๆ แล้�วเธอไม่�ม่%รู้ถ้]It would be nice if you helped me do the housework. [ม่�นน�าจะด%ถ้�าคุ�ณได�ชื่�วยฉั�นทำ(างานบ�านบ�าง] [จรู้�งๆ แล้�วเธอไม่�ชื่�วยเล้ย]

If I knew her name, I would tell you. (ถ้�าฉั�นรู้ �ชื่��อเธอ ฉั�นก็�น�าจะบอก็คุ�ณ) [จรู้�งๆ แล้�วไม่�รู้ �จ�ก็ชื่��อเธอ]She would be safer if she had a car. (เธอน�าจะปล้อดภั�ยก็ว�าน%& ถ้�าเธอม่%รู้ถ้) [จรู้�งๆ แล้�วเธอไม่�ม่%รู้ถ้]It would be nice if you helped me do the housework. [ม่�นน�าจะด%ถ้�าคุ�ณได�ชื่�วยฉั�นทำ(างานบ�านบ�าง] [จรู้�งๆ แล้�วเธอไม่�ชื่�วยเล้ย]

If-ClauseIf-Clause Main ClauseMain Clause

PasPast Simple t Simple

would + infinitivewould + infinitiveorcould + infinitive could + infinitive ormight + infinitivemight + infinitive

FormationFormation

ExamplesExamples

If-ClauseIf-Clause Main ClauseMain Clause

If I studiedstudied, I would passwould pass the exams.

If I studiedstudied, I could pass could pass the exams.

If I studiedstudied, I might pass might pass the exams.

If my friend James weren’t ill, we would play basketball with him.

If he had a lot of money, he would buy a new house.

If I didn’t have any homework to do, I would go out and play with friends.

If the weather were sunny and hot, we would go to the beach and swim.

If I had a red sport car, I would drive to work.

If I were an animal, I would be …

a dog a cat

an elephanta snake

a shark

If I were a super hero, I would be …

TYPE 3: PPastast-Unreal-Unreal//Unreal ConditionUnreal Condition

•Used to express conditions in the past that did not happen. Often used to express criticism or regret . เง�#อนไขึ้ทำ$#ไม�ม$ทำางเก ด้ขึ้"�นได้�เพราะเหต�การณ์�น��นได้�เก ด้ขึ้"�นไป็แล่�ว(อด้$ต) ม�กจะใช้�แสด้งถึ"งความเส$ยใจ เส$ยด้าย น�#นเองIf + Past Perfect, Subject + would have + V3

ใชื่�สม่ม่�ติ�ในส��งทำ%�เป,นไปไม่�ได�เล้ยหรู้�อติรู้งข้�าม่ก็�บคุวาม่จรู้�งในอด%ติ

For example

If he had tried harder , he might have won.

(ถึ�าเขึ้าพยายามมากกว�าน$�เขึ้าอาจได้�ช้�ยช้นะ)

If-ClauseIf-Clause Main ClauseMain Clause

Past PerfectPast PerfectSS++had had ++V3V3

would + have + past participlewould + have + past participleorcould + have + past participlecould + have + past participleormight + have + past participlemight + have + past participle

If-ClauseIf-Clause Main ClauseMain Clause

If I hadhad studiedstudied, I would have passedwould have passed the exams.

If I hadhad studiedstudied, I could have passed could have passed the exams.

If I hadhad studiedstudied, I might have passed might have passed the exams.

ExamplesExamples

FormationFormation

If I hadhad studiedstudied, I would have passedwould have passed the exams.

If we had known about Tsunami before,

they wouldn’t have died.

Type If clause Main clause

Type 0 General Truth

Present Simple

Present Simple

Type 1 Future

Possible

Present Simple

FutureSimple

Type 2 Present Unreal

Past Simple

Would+ V infinitive

Type 3 Past Unreal

Past Perfect

Would+ have+

V3

Conclusion

1.If it _________ (rain) heavily, our house _________ (leak).2.If we ________ (put) ice in the sun,it _________ (melt) quickly.3.If we _____________(feel) well, we ________(see) a doctor.4.If a dog ________ (see) stranger,it ________(bark).

1.If you ____________ (work) hard,you_______ _______(fail).2.If it ________(rain),I ___________(come) and meet you in the car.3.If it ___________ (rain) tomorrow,I _______ ___________ (stay) at home.

1.If I _________ (be) a bird, I _____________ (fly) everywhere.2.If you _________ (tell) me the truth,I ______ _____________________ (give) you some constructive advice.3.If there _________ (be) a typhoon tomorrow, I _______________ (be) very happy.

1.If it ____________(rain) yesterday, I ___________ _____________(stay) at home.2.If the principal __________________(allow) us to supervise the tuck shop, food poisoning ____________ ____________(occur) last Friday.3.If the chairman _______________(ask) me to help, I_______________(join) to fight for better hygienic conditions.

Exercise One

1. If you ___________________ (not come), You ________________ (miss ) the show.

do not come

will miss

2. John __________________ (buy)a car if he

_____________ (get)a job.

will buy

gets

3. Mary ________________(get) a toothache if

she_________________ (eat) too many sweets.

gets

eats

Exercise Two

1. If I ________________ (be) four years old, I

________________ (learn) to play the piano.

were

would learn

2. If I ________________ (not fail) in the

examination, my mother_______________ (buy)

me a new computer.

had not failed

would have bought

3. We ________________________ (finish) if we

________________ (have) better preparation.

would have finished

had had